HBM WALKTHROUGH · COMPLETE PUBLIC CODE INDEX

All the code, in one place.

You do not need to know which article step has code. Start with the walkthrough-bound sources, or search every registered framework, engine, operator, kernel, compiler, profiler, NVIDIA, and AMD/ROCm example.

PUBLIC COMPANION · NO LIVE WORKLOAD RECEIPT Source can be real and still not have run. Every card keeps that boundary visible.

Registered examples
188
Exact source lines
4,478
Walkthrough-bound sources
23
Live C-001 / V-001 runs
0

ONE IMPLEMENTATION PATH · EVERY LAYER REMAINS SEPARATE

Follow code from PyTorch to the GPU and HBM.

Start with the user-visible operation, then inspect what each software layer contributes. A framework call, compiler artifact, kernel, and hardware receipt are different objects. The links below open real registered source or an explicit missing-artifact state.

  1. 01
    PyTorch expression

    Model and operator code state the mathematical work.

    Open PyTorch SDPA
  2. 02
    torch.compile / Inductor

    Graph capture and lowering decide what can be fused or generated.

    Open compile_fx
  3. 03
    Operator library

    cuBLASLt, hipBLASLt, AITER, Composable Kernel, or another library can own the implementation branch.

    Open hipBLASLt
  4. 04
    Kernel language

    Triton, TileLang, Gluon, CuTe, CUTLASS, CUDA, or HIP express device work at different levels.

    Open TileLang
  5. 05
    Runtime and driver

    CUDA or ROCm/HIP submits memory and execution commands to a selected device.

    Open the CUDA path
  6. 06
    Compiler IR

    PTX, LLVM IR, or AMDGPU IR is an intermediate representation, not the final executed instruction stream.

    Open the PTX build path
  7. 07
    Device executable

    Cubin or HSACO packages target code for the NVIDIA or AMD device.

    Open the AMD HSACO boundary
  8. 08
    PTX to SASS / AMD ISA

    The final device instructions still need a dispatch identity and profiler correlation.

    See the missing SASS receipt
  9. 09
    GPU, cache, controller, HBM

    Only a joined run can show active SMs or CUs, cache outcomes, HBM bytes, elapsed time, power, and accepted output.

    Open the profiler layer

NVIDIA PATH

PyTorch → Inductor / library / DSL → CUDA → PTX → cubin / SASS → Blackwell SM → L2 → HBM3E

AMD PATH

PyTorch → library / DSL → ROCm / HIP → LLVM AMDGPU → HSACO / ISA → CDNA CU / MFMA → Infinity Cache → HBM3E

Start with what you mean

188 of 188 examples

glm52-fp8-config Pinned GLM-5.2 FP8 architecture fields 7 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

Pinned GLM-5.2 FP8 architecture fields

json

REGISTERED SOURCE · 7 DISPLAYED LINES

Source path not registered

     E01  {
     E02    "architectures": ["GlmMoeDsaForCausalLM"],
     E03    "num_hidden_layers": 78,
     E04    "n_routed_experts": 256,
     E05    "num_experts_per_tok": 8,
     E06    "quantization_config": {"quant_method": "fp8"}
     E07  }

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 7 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 {

This exact expression `{` contributes to the surrounding Pinned GLM-5.2 FP8 architecture fields statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `{` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 "architectures": ["GlmMoeDsaForCausalLM"],

This GLM-5.2 field selects the GlmMoeDsaForCausalLM model class when a compatible loader reads the configuration.

Source
The architecture name lets the model loader choose the Python implementation that constructs the GLM MoE causal-language-model graph.
Runtime / compiler
Class selection precedes weight loading and operator dispatch; this JSON field does not choose a serving engine or compiler.
GPU execution
No kernel, SM, warp, or tensor-core instruction is selected by the class name.
Memory path
The selected architecture shapes later parameter and activation objects, but it contains no allocation, placement, or HBM-traffic receipt.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 "num_hidden_layers": 78,

This exact GLM-5.2 configuration field declares 78 transformer blocks. It is model architecture, not a measured execution count.

Source
The model loader reads the integer and constructs or indexes 78 repeated block definitions.
Runtime / compiler
A serving engine can use the count while creating modules, loading parameter groups, and scheduling repeated layer traversal.
GPU execution
No SM, tensor core, warp, or kernel is selected by the JSON line itself.
Memory path
The count changes potential parameter and activation demand; placement, dtype, residency, cache hits, and HBM bytes remain unobserved.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 "n_routed_experts": 256,

This GLM-5.2 field declares a pool of 256 routed experts in each applicable MoE block.

Source
The loader uses the count when constructing expert modules and locating their parameter groups.
Runtime / compiler
The count defines the candidate expert pool; routing code still decides which experts receive each token at runtime.
GPU execution
It selects no GEMM kernel, collective, SM, warp, or tensor-core path by itself.
Memory path
A larger expert pool increases possible weight capacity, but active experts, sharding, residency, transfers, and HBM bytes depend on the deployed run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 "num_experts_per_tok": 8,

This GLM-5.2 field limits each routed token to eight selected experts.

Source
Routing output is interpreted as eight expert assignments per token for applicable MoE layers.
Runtime / compiler
The serving path can use the top-k value while grouping tokens, dispatching expert GEMMs, and combining results.
GPU execution
It does not identify the selected experts, GEMM kernel, CTA shape, SM, warp, or tensor-core instruction.
Memory path
Eight expert paths can change weight reads and token exchange; actual reuse, communication, and HBM traffic require the request trace.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 "quantization_config": {"quant_method": "fp8"}

This GLM-5.2 field declares FP8 as the checkpoint quantization method for the pinned model configuration.

Source
A compatible loader reads the quantization method while interpreting stored weight formats and quantization metadata.
Runtime / compiler
The runtime must still choose supported dequantization, GEMM, scaling, accumulation, and fallback paths.
GPU execution
The declaration does not prove FP8 tensor-core execution or identify a selected kernel.
Memory path
FP8 can reduce stored weight bytes relative to wider formats, but loaded residency, scales, activations, KV state, and observed HBM bytes remain unmeasured.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 7 Read this exact line
{
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This exact expression `{` contributes to the surrounding Pinned GLM-5.2 FP8 architecture fields statement. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.

What it means on the GPU

This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.

How bytes could move

It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.

Why this line could matter to useful work

If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · C-001 coding-agent walkthrough

Source path: not supplied

Revision: ba978f7d347eaf65d22f1a86833408afdb953541

C-001 model json coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: requestcontextrouteprefixprefillattention-moekernelmemorykvfabricdecodetool-verifypower-cost

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This json excerpt belongs to C-001 coding-agent walkthrough. Its registered role is Pinned GLM-5.2 FP8 architecture fields.
  1. 01 · BEFOREWhat enters

    A pinned checkpoint or configuration plus the workload's model requirements.

  2. 02 · THIS SOURCEWhat role it owns

    Defines model identity, architecture, tensor categories, or precision before an engine can load the workload.

  3. 03 · AFTERWhat leaves

    A model contract that a compatible framework or engine may load; it is not a device launch.

  4. 04 · VALUEWhy anyone cares

    Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the model layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Defines model identity, architecture, tensor categories, or precision before an engine can load the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned checkpoint or configuration plus the workload's model requirements. Output boundary: A model contract that a compatible framework or engine may load; it is not a device launch.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

c001-reference-harness Fail-closed C-001 event and artifact contract 15 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

Fail-closed C-001 event and artifact contract

python

REGISTERED SOURCE · 15 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/08-c001-integrated/c001_reference_harness.py

      27  EVENT_ORDER = (
      28      "request",
      29      "context",
      30      "route",
      31      "prefix_lookup",
      32      "prefill",
      33      "attention_moe",
      34      "lowering",
      35      "gpu_hbm",
      36      "kv_placement",
      37      "decode",
      38      "tool_call",
      39      "retry_verifier",
      40      "outcome_bill",
      41  )

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 15 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

27 EVENT_ORDER = (

This line binds or updates `EVENT_ORDER = (` for later source in Fail-closed C-001 event and artifact contract.

Source
The engine/control layer uses `EVENT_ORDER = (` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
28 "request",

This exact expression `"request",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"request",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
29 "context",

This exact expression `"context",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"context",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
30 "route",

This exact expression `"route",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"route",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
31 "prefix_lookup",

This exact expression `"prefix_lookup",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"prefix_lookup",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
32 "prefill",

This exact expression `"prefill",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"prefill",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
33 "attention_moe",

This exact expression `"attention_moe",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"attention_moe",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
34 "lowering",

This exact expression `"lowering",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"lowering",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
35 "gpu_hbm",

This exact expression `"gpu_hbm",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"gpu_hbm",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
36 "kv_placement",

This exact expression `"kv_placement",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"kv_placement",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
37 "decode",

This exact expression `"decode",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"decode",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
38 "tool_call",

This exact expression `"tool_call",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"tool_call",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
39 "retry_verifier",

This exact expression `"retry_verifier",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"retry_verifier",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
40 "outcome_bill",

This exact expression `"outcome_bill",` contributes to the surrounding Fail-closed C-001 event and artifact contract statement.

Source
The engine/control layer uses `"outcome_bill",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
41 )

This line closes the surrounding expression or code block and adds no operation by itself.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 15 Read this exact line
EVENT_ORDER = (
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line binds or updates `EVENT_ORDER = (` for later source in Fail-closed C-001 event and artifact contract.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · OCWC22

Source path: examples/hbm-learning-journey/nvidia/08-c001-integrated/c001_reference_harness.py

Revision: 91b884c342cf6e02329b3db2a3a0830895bb340d

C-001 engine python coverage: fixture_backed observation: supported evidence: touchdown_derived
Indexed phases: requestcontexttool-verifypower-cost

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is Fail-closed C-001 event and artifact contract.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

c001-workload-spine Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract 31 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract

python

REGISTERED SOURCE · 31 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/08-c001-integrated/c001_joined_resource_receipt.py

     E01  WORKLOAD = {
     E02      "fixture_id": "C-001",
     E03      "harness": "Hermes Agent",
     E04      "model": "zai-org/GLM-5.2-FP8",
     E05      "task": (
     E06          "Inspect the repository, make one bounded code change, use the declared "
     E07          "tools, run the tests, and return a reviewable patch only after the "
     E08          "named verifier passes."
     E09      ),
     E10      "prompt_parts": (
     E11          "system instructions",
     E12          "tool schemas",
     E13          "repository map and selected files",
     E14          "prior turns and tool results",
     E15          "current task and acceptance test",
     E16      ),
     E17      "tools": ("read_file", "search", "apply_patch", "terminal", "test_verifier"),
     E18      "precision": {
     E19          "checkpoint": "FP8",
     E20          "activations": None,
     E21          "kv_cache": None,
     E22          "accumulation": None,
     E23          "reason": "A checkpoint label does not prove every runtime dtype.",
     E24      },
     E25  }
     E26
     E27  TRACE_ORDER = (
     E28      "request", "context", "route", "prefix_lookup", "prefill",
     E29      "attention_moe", "operator_and_kernel", "hbm_traffic", "kv_placement",
     E30      "fabric_movement", "decode", "tool_and_verifier", "power_cooling_water_cost",
     E31  )

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Copy engine or SM-issued movementPOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 31 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 WORKLOAD = {

This line binds or updates `WORKLOAD = {` for later source in Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `WORKLOAD = {` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 "fixture_id": "C-001",

This line declares `fixture_id = "C-001"` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `fixture_id = "C-001"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 "harness": "Hermes Agent",

This line declares `harness = "Hermes Agent"` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `harness = "Hermes Agent"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 "model": "zai-org/GLM-5.2-FP8",

This line declares `model = "zai-org/GLM-5.2-FP8"` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `model = "zai-org/GLM-5.2-FP8"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 "task": (

This line declares `task = (` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `task = (` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 "Inspect the repository, make one bounded code change, use the declared "

This exact expression `"Inspect the repository, make one bounded code change, use the declared "` contributes to the surrounding Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"Inspect the repository, make one bounded code change, use the declared "` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 "tools, run the tests, and return a reviewable patch only after the "

This exact expression `"tools, run the tests, and return a reviewable patch only after the "` contributes to the surrounding Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"tools, run the tests, and return a reviewable patch only after the "` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 "named verifier passes."

This exact expression `"named verifier passes."` contributes to the surrounding Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"named verifier passes."` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 ),

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 "prompt_parts": (

This line declares `prompt_parts = (` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `prompt_parts = (` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 "system instructions",

This exact expression `"system instructions",` contributes to the surrounding Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"system instructions",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 "tool schemas",

This exact expression `"tool schemas",` contributes to the surrounding Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"tool schemas",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 "repository map and selected files",

This exact expression `"repository map and selected files",` contributes to the surrounding Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"repository map and selected files",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 "prior turns and tool results",

This exact expression `"prior turns and tool results",` contributes to the surrounding Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"prior turns and tool results",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 "current task and acceptance test",

This exact expression `"current task and acceptance test",` contributes to the surrounding Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"current task and acceptance test",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 ),

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 "tools": ("read_file", "search", "apply_patch", "terminal", "test_verifier"),

This line declares `tools = ("read_file", "search", "apply_patch", "terminal", "test_verifier")` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `tools = ("read_file", "search", "apply_patch", "terminal", "test_verifier")` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 "precision": {

This line declares `precision = {` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `precision = {` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 "checkpoint": "FP8",

This line declares `checkpoint = "FP8"` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `checkpoint = "FP8"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 "activations": None,

This line declares `activations = None` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `activations = None` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 "kv_cache": None,

This line declares `kv_cache = None` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `kv_cache = None` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 "accumulation": None,

This line declares `accumulation = None` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `accumulation = None` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 "reason": "A checkpoint label does not prove every runtime dtype.",

This line declares `reason = "A checkpoint label does not prove every runtime dtype."` as an exact configuration value used by Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `reason = "A checkpoint label does not prove every runtime dtype."` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 },

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 TRACE_ORDER = (

This line binds or updates `TRACE_ORDER = (` for later source in Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `TRACE_ORDER = (` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 "request", "context", "route", "prefix_lookup", "prefill",

This exact expression `"request", "context", "route", "prefix_lookup", "prefill",` contributes to the surrounding Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"request", "context", "route", "prefix_lookup", "prefill",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 "attention_moe", "operator_and_kernel", "hbm_traffic", "kv_placement",

This exact expression `"attention_moe", "operator_and_kernel", "hbm_traffic", "kv_placement",` contributes to the surrounding Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"attention_moe", "operator_and_kernel", "hbm_traffic", "kv_placement",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 "fabric_movement", "decode", "tool_and_verifier", "power_cooling_water_cost",

This exact expression `"fabric_movement", "decode", "tool_and_verifier", "power_cooling_water_cost",` contributes to the surrounding Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"fabric_movement", "decode", "tool_and_verifier", "power_cooling_water_cost",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 31 Read this exact line
WORKLOAD = {
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKCopy engine or SM-issued movement
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line binds or updates `WORKLOAD = {` for later source in Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · OCWC22

Source path: examples/hbm-learning-journey/nvidia/08-c001-integrated/c001_joined_resource_receipt.py

Revision: e931c19c737266d5575e51cb1d61ac203822614e

C-001 engine python coverage: fixture_backed observation: supported evidence: touchdown_derived
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is Hermes + GLM-5.2 FP8 prompt, tools, and thirteen-phase contract.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    This is the public C-001 teaching fixture, not a captured private Hermes system prompt or a GLM-5.2 run.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

engine-launch-surfaces Engine capability probes and launch surfaces 7 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

Engine capability probes and launch surfaces

bash

REGISTERED SOURCE · 7 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

      29  cat <<'NOTE'
      30  Reference launch surfaces only:
      31    vLLM:            vllm serve <exact-model-revision> --enable-prefix-caching
      32    SGLang/HiCache:  python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache
      33    LMCache:         configure a named vLLM/SGLang connector version and prove lookup/store events
      34    TensorRT-LLM:    trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported
      35  NOTE

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 7 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

29 cat <<'NOTE'

This line invokes `cat` in the Engine capability probes and launch surfaces source surface.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
30 Reference launch surfaces only:

This line invokes `Reference` in the Engine capability probes and launch surfaces source surface.

Source
The host shell invokes `Reference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
31 vLLM: vllm serve <exact-model-revision> --enable-prefix-caching

This line invokes `vLLM:` in the Engine capability probes and launch surfaces source surface.

Source
The host shell invokes `vLLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
32 SGLang/HiCache: python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache

This line invokes `SGLang/HiCache:` in the Engine capability probes and launch surfaces source surface.

Source
The host shell invokes `SGLang/HiCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
33 LMCache: configure a named vLLM/SGLang connector version and prove lookup/store events

This line invokes `LMCache:` in the Engine capability probes and launch surfaces source surface.

Source
The host shell invokes `LMCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
34 TensorRT-LLM: trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported

This line invokes `TensorRT-LLM:` in the Engine capability probes and launch surfaces source surface.

Source
The host shell invokes `TensorRT-LLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
35 NOTE

This line invokes `NOTE` in the Engine capability probes and launch surfaces source surface.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 7 Read this exact line
cat <<'NOTE'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `cat` in the Engine capability probes and launch surfaces source surface.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · OCWC22

Source path: examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

Revision: 91b884c342cf6e02329b3db2a3a0830895bb340d

C-001 engine bash coverage: fixture_backed observation: supported evidence: touchdown_derived
Indexed phases: routeprefillattention-moekernelmemorydecode

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to C-001 coding-agent walkthrough. Its registered role is Engine capability probes and launch surfaces.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    A launch surface is not a successful workload run.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nixl-kv-movement-boundary NIXL/KV movement capability and physical-transport receipt 16 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

NIXL/KV movement capability and physical-transport receipt

bash

COMPLETE REGISTERED EXCERPT · 16 DISPLAYED LINES · SOURCE GAP SHOWN

examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

       7  for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do
       8    if command -v "$tool" >/dev/null; then
       9      printf '%s=' "$tool"
      10      "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true
      11    else
      12      echo "$tool=missing"
      13    fi
      14  done
  GAP-01  # ... (package-version probe elided) ...
      29  cat <<'NOTE'
      30  Required receipt fields for any transfer claim:
      31    source_tier, destination_tier, bytes, registration_us, submit_us,
      32    completion_us, transport, fallback, retry_count, run_id.
      33  Do not call host memory CXL memory unless the physical platform and NUMA/CXL
      34  topology prove it.
      35  NOTE

The registered excerpt contains a visible source gap. It is not the whole upstream function or file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Copy engine or SM-issued movementPOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 16 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

7 for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do

This line begins the repeated control path `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` inside NIXL/KV movement capability and physical-transport receipt.

Source
The engine/control layer uses `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
8 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes.

Source
The engine/control layer uses `if command -v "$tool" >/dev/null; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
9 printf '%s=' "$tool"

This line invokes `printf` in the NIXL/KV movement capability and physical-transport receipt source surface.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
10 "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` contributes to the surrounding NIXL/KV movement capability and physical-transport receipt statement.

Source
The engine/control layer uses `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
11 else

This line selects a control path using `else` when the surrounding code executes.

Source
The engine/control layer uses `else` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
12 echo "$tool=missing"

This line invokes `echo` in the NIXL/KV movement capability and physical-transport receipt source surface.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
13 fi

This line invokes `fi` in the NIXL/KV movement capability and physical-transport receipt source surface.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
14 done

This line invokes `done` in the NIXL/KV movement capability and physical-transport receipt source surface.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
GAP-01 # ... (package-version probe elided) ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
29 cat <<'NOTE'

This line invokes `cat` in the NIXL/KV movement capability and physical-transport receipt source surface.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
30 Required receipt fields for any transfer claim:

This line invokes `Required` in the NIXL/KV movement capability and physical-transport receipt source surface.

Source
The host shell invokes `Required` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
31 source_tier, destination_tier, bytes, registration_us, submit_us,

This line invokes `source_tier,` in the NIXL/KV movement capability and physical-transport receipt source surface.

Source
The host shell invokes `source_tier,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
32 completion_us, transport, fallback, retry_count, run_id.

This line invokes `completion_us,` in the NIXL/KV movement capability and physical-transport receipt source surface.

Source
The host shell invokes `completion_us,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
33 Do not call host memory CXL memory unless the physical platform and NUMA/CXL

This line invokes `Do` in the NIXL/KV movement capability and physical-transport receipt source surface.

Source
The host shell invokes `Do` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
34 topology prove it.

This line invokes `topology` in the NIXL/KV movement capability and physical-transport receipt source surface.

Source
The host shell invokes `topology` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
35 NOTE

This line invokes `NOTE` in the NIXL/KV movement capability and physical-transport receipt source surface.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 16 Read this exact line
for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKCopy engine or SM-issued movement
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the repeated control path `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` inside NIXL/KV movement capability and physical-transport receipt.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.

Why this line could matter to useful work

This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · OCWC22

Source path: examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

Revision: 91b884c342cf6e02329b3db2a3a0830895bb340d

C-001 engine bash coverage: parser_only observation: supported evidence: touchdown_derived
Indexed phases: kvfabric

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to C-001 coding-agent walkthrough. Its registered role is NIXL/KV movement capability and physical-transport receipt.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    NIXL is orchestration software. The physical path may be NVLink, PCIe, RDMA, storage, or another selected plugin; no C-001 transfer is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

flashinfer-shape-probe FlashInfer prefill and decode shape probe 2 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

FlashInfer prefill and decode shape probe

python

REGISTERED SOURCE · 2 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/03-kernels/flashinfer_attention.py

      21      prefill = single_prefill_with_kv_cache(q, k, v, causal=False, kv_layout="NHD")
      22      decode = single_decode_with_kv_cache(q[-1], k, v, kv_layout="NHD")

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 2 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

21 prefill = single_prefill_with_kv_cache(q, k, v, causal=False, kv_layout="NHD")

This line calls `single_prefill_with_kv_cache(...)` and binds its returned value to `prefill` for later use in FlashInfer prefill and decode shape probe.

Source
The operator layer uses `prefill ← single_prefill_with_kv_cache(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
22 decode = single_decode_with_kv_cache(q[-1], k, v, kv_layout="NHD")

This line calls `single_decode_with_kv_cache(...)` and binds its returned value to `decode` for later use in FlashInfer prefill and decode shape probe.

Source
The operator layer uses `decode ← single_decode_with_kv_cache(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 2 Read this exact line
prefill = single_prefill_with_kv_cache(q, k, v, causal=False, kv_layout="NHD")
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line calls `single_prefill_with_kv_cache(...)` and binds its returned value to `prefill` for later use in FlashInfer prefill and decode shape probe.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · OCWC22

Source path: examples/hbm-learning-journey/nvidia/03-kernels/flashinfer_attention.py

Revision: 91b884c342cf6e02329b3db2a3a0830895bb340d

C-001 operator python coverage: fixture_backed observation: supported evidence: touchdown_derived
Indexed phases: prefixprefillattention-moekerneldecode

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is FlashInfer prefill and decode shape probe.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Synthetic attention shapes; not a GLM-5.2 dispatch receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cuda-memory-path CUDA allocation, launch, and copy path 8 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

CUDA allocation, launch, and copy path

cuda

COMPLETE REGISTERED EXCERPT · 8 DISPLAYED LINES · SOURCE GAP SHOWN

examples/hbm-learning-journey/nvidia/02-runtime/cuda_path.cu

      38      // cudaMallocAsync uses the device's default stream-ordered memory pool.
      39      float* values = nullptr;
      40      CUDA_CHECK(cudaMallocAsync(&values, bytes, stream));
      41      CUDA_CHECK(cudaMemsetAsync(values, 0, bytes, stream));
      57      // ... (CUDA graph capture + kernel launch elided) ...
      58      CUDA_CHECK(cudaEventElapsedTime(&elapsed_ms, start, stop));
      59      CUDA_CHECK(cudaMemcpyAsync(&first, values, sizeof(first), cudaMemcpyDeviceToHost, stream));
      60      CUDA_CHECK(cudaStreamSynchronize(stream));

The registered excerpt contains a visible source gap. It is not the whole upstream function or file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 8 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

38 // cudaMallocAsync uses the device's default stream-ordered memory pool.

This comment documents `cudaMallocAsync uses the device's default stream-ordered memory pool.` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
39 float* values = nullptr;

This line binds or updates `values = nullptr` for later source in CUDA allocation, launch, and copy path.

Source
The kernel source uses `values = nullptr` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
40 CUDA_CHECK(cudaMallocAsync(&values, bytes, stream));

This wrapped CUDA call requests `bytes` of stream-ordered device allocation and stores the returned address in `values`.

Source
CUDA_CHECK validates the cudaMallocAsync status while the runtime writes the allocated device pointer through `&values`.
Runtime / compiler
The CUDA allocator services the request from a stream-ordered memory pool subject to pool state and stream ordering.
GPU execution
Allocation is a runtime/allocator action, not an SM or tensor-core kernel.
Memory path
The requested byte count is explicit, but physical page backing, pool reuse, residency, and whether the allocation occupies HBM require runtime evidence.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
41 CUDA_CHECK(cudaMemsetAsync(values, 0, bytes, stream));

This wrapped CUDA call asynchronously fills the `values` allocation with zero for `bytes` bytes on `stream`.

Source
CUDA_CHECK validates the cudaMemsetAsync status and preserves stream ordering.
Runtime / compiler
The CUDA runtime enqueues a device-memory fill operation after earlier dependencies in the stream.
GPU execution
The runtime may use a fill kernel or device copy path; this source does not identify which execution engine is selected.
Memory path
The destination and requested byte count are explicit, but cache behavior, transactions, timing, and observed HBM writes need a run.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
57 // ... (CUDA graph capture + kernel launch elided) ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
58 CUDA_CHECK(cudaEventElapsedTime(&elapsed_ms, start, stop));

This wrapped CUDA call computes elapsed milliseconds between the previously recorded `start` and `stop` events.

Source
CUDA_CHECK validates the query and writes the elapsed duration through `&elapsed_ms`.
Runtime / compiler
The CUDA runtime converts completed event timestamps into a host-visible interval.
GPU execution
The timing query does not select a workload execution unit and cannot attribute time to one SM or kernel by itself.
Memory path
Elapsed time is not HBM traffic, power, energy, water, or cost; those require synchronized same-run telemetry.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
59 CUDA_CHECK(cudaMemcpyAsync(&first, values, sizeof(first), cudaMemcpyDeviceToHost, stream));

This call enqueues an asynchronous CUDA copy on the supplied stream.

Source
The arguments declare source, destination, byte count, transfer direction, and stream ordering.
Runtime / compiler
The CUDA runtime submits a copy operation that can overlap with other stream work subject to dependencies.
GPU execution
A copy engine or runtime-managed transfer path may perform the movement; this source does not prove the selected engine.
Memory path
Direction and byte-count arguments bound the requested movement; physical link, cache interaction, timing, and observed HBM traffic need a receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
60 CUDA_CHECK(cudaStreamSynchronize(stream));

This wrapped CUDA call blocks the host until all previously submitted work on `stream` completes.

Source
CUDA_CHECK surfaces synchronization failure after the runtime waits for the stream completion point.
Runtime / compiler
The host thread waits; this closes the asynchronous interval before reading results or reporting timing.
GPU execution
It waits on already selected device work and does not choose a kernel, SM, warp, or copy engine.
Memory path
Synchronization can expose transfer or kernel completion but does not itself report cache, HBM bytes, power, or energy.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 8 Read this exact line
// cudaMallocAsync uses the device's default stream-ordered memory pool.
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `cudaMallocAsync uses the device's default stream-ordered memory pool.` for the reader; it executes nothing.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · OCWC22

Source path: examples/hbm-learning-journey/nvidia/02-runtime/cuda_path.cu

Revision: 91b884c342cf6e02329b3db2a3a0830895bb340d

C-001 kernel cuda coverage: fixture_backed observation: supported evidence: touchdown_derived
Indexed phases: prefillkernelmemorykvfabricdecode

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to C-001 coding-agent walkthrough. Its registered role is CUDA allocation, launch, and copy path.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Runnable CUDA teaching path; not the GLM-5.2 production kernel.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

detected-ptx-build PTX/cubin build-and-inspect probe (Touchdown teaching fixture) 4 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

PTX/cubin build-and-inspect probe (Touchdown teaching fixture)

bash

REGISTERED SOURCE · 4 DISPLAYED LINES

docs/content/drafts/2026-07-10-hbm-memory-first-publication-system/fixtures/c001-ptx-cubin-build-probe.sh

     E01  sm="$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | head -n1 | tr -d '.')"
     E02
     E03  nvcc -gencode "arch=compute_${sm},code=sm_${sm}" -cubin "$kernel_src" -o "$out/kernel_only.cubin"
     E04  cuobjdump --dump-ptx "$out/kernel_only.cubin" > "$out/kernel_only.ptx.txt"

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 4 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 sm="$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | head -n1 | tr -d '.')"

This shell assignment reads the first GPU's compute capability and removes the decimal point to form an `sm` target such as `90`.

Source
Command substitution stores the normalized architecture number in the shell variable `sm`.
Runtime / compiler
The later nvcc command uses the value as its compile target; this probe does not compile by itself.
GPU execution
Querying device capability launches no workload kernel.
Memory path
The query records no tensor placement, cache behavior, or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 nvcc -gencode "arch=compute_${sm},code=sm_${sm}" -cubin "$kernel_src" -o "$out/kernel_only.cubin"

This command compiles `kernel_src` into a cubin targeted at the detected `sm` architecture.

Source
nvcc reads the CUDA source and writes `kernel_only.cubin` in the output directory.
Runtime / compiler
The CUDA toolchain lowers source into target machine code; compilation is not a workload launch.
GPU execution
The cubin can contain instructions for the detected architecture, but no SM executes them until a later load and launch.
Memory path
Compiler output can be inspected for memory instructions but proves no runtime addresses, cache outcomes, or HBM bytes.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuobjdump --dump-ptx "$out/kernel_only.cubin" > "$out/kernel_only.ptx.txt"

This shell command extracts embedded PTX text from the pinned CUDA binary for inspection.

Source
cuobjdump reads the cubin file and writes a textual PTX artifact.
Runtime / compiler
This is artifact inspection after compilation, not workload execution.
GPU execution
No device instruction, warp, SM, or tensor core executes because of the inspection command.
Memory path
The command reads host storage and writes host output; it proves no GPU-cache or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 4 Read this exact line
sm="$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | head -n1 | tr -d '.')"
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This shell assignment reads the first GPU's compute capability and removes the decimal point to form an `sm` target such as `90`.

What changes next in software

The later nvcc command uses the value as its compile target; this probe does not compile by itself.

What it means on the GPU

Querying device capability launches no workload kernel.

How bytes could move

The query records no tensor placement, cache behavior, or HBM traffic.

Why this line could matter to useful work

If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · OCWC22

Source path: docs/content/drafts/2026-07-10-hbm-memory-first-publication-system/fixtures/c001-ptx-cubin-build-probe.sh

Revision: not supplied

C-001 ir-ptx bash coverage: fixture_backed observation: supported evidence: touchdown_derived
Indexed phases: prefillattention-moekernelmemorydecode
No separate source URL registered

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to C-001 coding-agent walkthrough. Its registered role is PTX/cubin build-and-inspect probe (Touchdown teaching fixture).
  1. 01 · BEFOREWhat enters

    Framework graphs, operator definitions, specialization parameters, and compiler options.

  2. 02 · THIS SOURCEWhat role it owns

    Represents the compiler boundary between high-level operations and a target-specific executable.

  3. 03 · AFTERWhat leaves

    IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

  4. 04 · VALUEWhy anyone cares

    Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

  5. 05 · PROOFWhat is still missing

    This replaces a prior excerpt that did not match any real file in the repository (the previous build_artifacts.sh pin uses 'cuobjdump --dump-elf' + 'nvdisasm', never '--dump-ptx', and different flag/variable names). This new c001-ptx-cubin-build-probe.sh fixture is a genuinely existing, minimal, correct nvcc/cuobjdump teaching script; it is not the GLM-5.2 production kernel and has not been executed as part of this publication.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the ir-ptx layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Represents the compiler boundary between high-level operations and a target-specific executable. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Framework graphs, operator definitions, specialization parameters, and compiler options. Output boundary: IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

sass-not-captured Executable instruction stream 1 lines UNSUPPORTED FOR THIS TRACE

START HERE · SEE THE CODE FIRST

Executable instruction stream

text

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  No scene-bound example for this phase and tab. Capture the pinned cubin, then save cuobjdump --dump-sass output.

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 No scene-bound example for this phase and tab. Capture the pinned cubin, then save cuobjdump --dump-sass output.

This exact expression `No scene-bound example for this phase and tab. Capture the pinned cubin, then save cuob…` contributes to the surrounding Executable instruction stream statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The device-ISA plane uses `No scene-bound example for this phase and tab. Capture the pinned cubin, then save cuob…` as an instruction or binary-level declaration.
Runtime / compiler
The driver loads a compiled binary and the scheduler issues the instruction only in a real launch.
GPU execution
Opcode and target architecture identify a possible execution unit; active warp/wavefront and issue slot require a trace.
Memory path
Memory opcodes imply an address space, but address, cache hit, transaction count, and HBM bytes require runtime counters.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
No scene-bound example for this phase and tab. Capture the pinned cubin, then save cuobjdump --dump-sass output.
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This exact expression `No scene-bound example for this phase and tab. Capture the pinned cubin, then save cuob…` contributes to the surrounding Executable instruction stream statement. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The driver loads a compiled binary and the scheduler issues the instruction only in a real launch.

What it means on the GPU

Opcode and target architecture identify a possible execution unit; active warp/wavefront and issue slot require a trace.

How bytes could move

Memory opcodes imply an address space, but address, cache hit, transaction count, and HBM bytes require runtime counters.

Why this line could matter to useful work

This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · C-001 coding-agent walkthrough

Source path: not supplied

Revision: not supplied

C-001 sass text coverage: not_started observation: not_observed evidence: not_public
Indexed phases: prefillattention-moekernelmemorydecode
No separate source URL registered

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This text excerpt belongs to C-001 coding-agent walkthrough. Its registered role is Executable instruction stream.
  1. 01 · BEFOREWhat enters

    A compiled cubin, code object, or another target executable.

  2. 02 · THIS SOURCEWhat role it owns

    Shows target device instructions or the inspection path used to obtain them.

  3. 03 · AFTERWhat leaves

    An inspectable ISA artifact; it does not prove the instruction stream executed for the accepted task.

  4. 04 · VALUEWhy anyone cares

    ISA inspection can explain stalls, instruction mix, and hardware fit. It supports a decision only when joined to dispatch, counters, correctness, and workload value.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the sass layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

ISA inspection can explain stalls, instruction mix, and hardware fit. It supports a decision only when joined to dispatch, counters, correctness, and workload value.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Shows target device instructions or the inspection path used to obtain them. The current record is coverage=not_started and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A compiled cubin, code object, or another target executable. Output boundary: An inspectable ISA artifact; it does not prove the instruction stream executed for the accepted task.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nsight-capture NVTX, Nsight Systems, Nsight Compute, and telemetry capture 10 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

NVTX, Nsight Systems, Nsight Compute, and telemetry capture

bash

REGISTERED SOURCE · 10 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

      13  nvidia-smi -q > "$out/nvidia-smi-q.txt"
      14  nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"
      15  dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true
      16
      17  nsys profile \
      18    --trace=cuda,nvtx,osrt \
      19    --sample=none \
      20    --force-overwrite=true \
      21    --output="$out/timeline" \
      22    "$@"

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 10 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

13 nvidia-smi -q > "$out/nvidia-smi-q.txt"

This command writes the selected NVIDIA device's detailed `nvidia-smi -q` inventory and telemetry snapshot to the receipt directory.

Source
The shell redirects the device query into `nvidia-smi-q.txt`.
Runtime / compiler
It captures host-visible device state and does not launch the target workload.
GPU execution
No workload kernel or execution unit is selected.
Memory path
The report can contain capacity and device telemetry, but it is not per-operation HBM traffic or same-run task energy by itself.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
14 nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"

This command records the host-visible NVIDIA device topology matrix in the receipt directory.

Source
The shell redirects `nvidia-smi topo -m` output to `nvidia-smi-topo.txt`.
Runtime / compiler
It inventories possible peer and host paths; it does not prove that the workload used one.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
Topology labels constrain possible movement paths but do not report bytes, link use, HBM traffic, or timing.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
15 dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true

This command records DCGM's discoverable GPU inventory and tolerates an unavailable DCGM installation.

Source
Output and errors go to `dcgm-discovery.txt`; `|| true` keeps the surrounding capture script running on failure.
Runtime / compiler
It probes monitoring availability and does not launch the model.
GPU execution
No workload execution unit is selected.
Memory path
Discovery proves no tensor placement, transfer, HBM traffic, power, or energy.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
16 blank line

This blank line separates logical parts of the excerpt and executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
17 nsys profile \

This command runs the declared target under Nsight Systems and requests the named trace domains.

Source
The CLI configures trace collection and an output artifact around the child process.
Runtime / compiler
Instrumentation can capture CUDA, NVTX, OS-runtime, and timing events and can add measurement overhead.
GPU execution
Profiler configuration does not select a workload kernel or GPU execution unit.
Memory path
A resulting trace may correlate transfers and kernels, but this command alone proves no tensor residency or HBM byte count.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
18 --trace=cuda,nvtx,osrt \

This continuation argument asks Nsight Systems to trace CUDA, NVTX, and OS-runtime events.

Source
The option configures which event domains appear in the generated timeline.
Runtime / compiler
Tracing wraps the later target command and can add collection overhead.
GPU execution
It observes API and timing events but does not select a workload kernel.
Memory path
The event domains can expose transfer calls, but counters and HBM bytes still require the captured trace.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
19 --sample=none \

This continuation argument disables periodic CPU instruction-pointer sampling during the Nsight Systems capture.

Source
The trace keeps the requested event domains without CPU sampling records.
Runtime / compiler
It changes profiler collection overhead and report contents, not workload semantics.
GPU execution
No GPU execution unit is selected.
Memory path
The option reports no tensor placement, transfer size, or HBM traffic.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
20 --force-overwrite=true \

This continuation argument allows the profiler to replace an existing output artifact at the chosen path.

Source
The capture does not stop merely because a prior file uses the same output name.
Runtime / compiler
It changes output-file handling only.
GPU execution
No GPU execution unit is selected.
Memory path
It changes host filesystem behavior, not GPU memory traffic.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
21 --output="$out/timeline" \

This continuation argument names the `timeline` output inside the receipt directory.

Source
Nsight Systems writes the captured artifact under the declared output prefix.
Runtime / compiler
It controls host artifact placement, not model dispatch.
GPU execution
No GPU execution unit is selected.
Memory path
The output path records no HBM movement until a real capture is produced.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
22 "$@"

This final shell line executes the exact command and arguments passed into the capture wrapper.

Source
The wrapper preserves argument boundaries and runs the caller-supplied target under Nsight Systems.
Runtime / compiler
The target command determines which engine, compiler, and workload paths actually execute.
GPU execution
Only the target's later dispatch can select kernels and GPU execution units.
Memory path
Only the target plus captured trace can establish tensor movement, cache behavior, or HBM traffic.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 10 Read this exact line
nvidia-smi -q > "$out/nvidia-smi-q.txt"
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This command writes the selected NVIDIA device's detailed `nvidia-smi -q` inventory and telemetry snapshot to the receipt directory.

What changes next in software

It captures host-visible device state and does not launch the target workload.

What it means on the GPU

No workload kernel or execution unit is selected.

How bytes could move

The report can contain capacity and device telemetry, but it is not per-operation HBM traffic or same-run task energy by itself.

Why this line could matter to useful work

This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · OCWC22

Source path: examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

Revision: 91b884c342cf6e02329b3db2a3a0830895bb340d

C-001 profile bash coverage: fixture_backed observation: supported evidence: touchdown_derived
Indexed phases: prefillattention-moekernelmemorykvfabricdecodetool-verifypower-cost

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to C-001 coding-agent walkthrough. Its registered role is NVTX, Nsight Systems, Nsight Compute, and telemetry capture.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

c001-receipt-join One run ID joins code, HBM, fabric, power, cooling, water, and cost 20 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

One run ID joins code, HBM, fabric, power, cooling, water, and cost

python

REGISTERED SOURCE · 20 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/08-c001-integrated/c001_joined_resource_receipt.py

     E01  def join_receipts(receipts: list[Receipt]) -> dict[str, Any]:
     E02      """Join one run or fail closed without inventing downstream values."""
     E03
     E04      by_kind = {receipt.kind: receipt for receipt in receipts}
     E05      run_ids = {receipt.run_id for receipt in receipts if receipt.run_id}
     E06      missing = [kind for kind in REQUIRED_RECEIPTS if kind not in by_kind]
     E07      if len(run_ids) != 1 or missing:
     E08          return {
     E09              "status": (
     E10                  "INVALID / MIXED RUN IDS"
     E11                  if len(run_ids) > 1
     E12                  else "ARCHITECTURE ONLY / RUN NOT CAPTURED"
     E13              ),
     E14              "run_id": None,
     E15              "missing_receipts": missing,
     E16              "hbm_bytes": None, "fabric_bytes": None,
     E17              "device_energy_j": None, "facility_energy_kwh": None,
     E18              "cooling_energy_kwh": None, "water_liters_consumed": None,
     E19              "cost_per_accepted_patch_usd": None,
     E20          }

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 20 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 def join_receipts(receipts: list[Receipt]) -> dict[str, Any]:

This line begins the `join_receipts` callable contract used by One run ID joins code, HBM, fabric, power, cooling, water, and cost; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `join_receipts` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """Join one run or fail closed without inventing downstream values."""

This documentation line explains `Join one run or fail closed without inventing downstream values.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 by_kind = {receipt.kind: receipt for receipt in receipts}

This line binds or updates `by_kind = {receipt.kind: receipt for receipt in receipts}` for later source in One run ID joins code, HBM, fabric, power, cooling, water, and cost. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `by_kind = {receipt.kind: receipt for receipt in receipts}` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 run_ids = {receipt.run_id for receipt in receipts if receipt.run_id}

This line binds or updates `run_ids = {receipt.run_id for receipt in receipts if receipt.run_id}` for later source in One run ID joins code, HBM, fabric, power, cooling, water, and cost. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `run_ids = {receipt.run_id for receipt in receipts if receipt.run_id}` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 missing = [kind for kind in REQUIRED_RECEIPTS if kind not in by_kind]

This line binds or updates `missing = [kind for kind in REQUIRED_RECEIPTS if kind not in by_kind]` for later source in One run ID joins code, HBM, fabric, power, cooling, water, and cost. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `missing = [kind for kind in REQUIRED_RECEIPTS if kind not in by_kind]` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 if len(run_ids) != 1 or missing:

This line selects a control path using `if len(run_ids) != 1 or missing:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `if len(run_ids) != 1 or missing:` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 return {

This line returns `return {` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `return {` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 "status": (

This line declares `status = (` as an exact configuration value used by One run ID joins code, HBM, fabric, power, cooling, water, and cost. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `status = (` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 "INVALID / MIXED RUN IDS"

This exact expression `"INVALID / MIXED RUN IDS"` contributes to the surrounding One run ID joins code, HBM, fabric, power, cooling, water, and cost statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `"INVALID / MIXED RUN IDS"` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 if len(run_ids) > 1

This line selects a control path using `if len(run_ids) > 1` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `if len(run_ids) > 1` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 else "ARCHITECTURE ONLY / RUN NOT CAPTURED"

This line selects a control path using `else "ARCHITECTURE ONLY / RUN NOT CAPTURED"` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `else "ARCHITECTURE ONLY / RUN NOT CAPTURED"` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 ),

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 "run_id": None,

This line declares `run_id = None` as an exact configuration value used by One run ID joins code, HBM, fabric, power, cooling, water, and cost. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `run_id = None` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 "missing_receipts": missing,

This line declares `missing_receipts = missing` as an exact configuration value used by One run ID joins code, HBM, fabric, power, cooling, water, and cost. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `missing_receipts = missing` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 "hbm_bytes": None, "fabric_bytes": None,

This line declares `hbm_bytes = None, "fabric_bytes": None` as an exact configuration value used by One run ID joins code, HBM, fabric, power, cooling, water, and cost. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `hbm_bytes = None, "fabric_bytes": None` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 "device_energy_j": None, "facility_energy_kwh": None,

This line declares `device_energy_j = None, "facility_energy_kwh": None` as an exact configuration value used by One run ID joins code, HBM, fabric, power, cooling, water, and cost. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `device_energy_j = None, "facility_energy_kwh": None` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 "cooling_energy_kwh": None, "water_liters_consumed": None,

This line declares `cooling_energy_kwh = None, "water_liters_consumed": None` as an exact configuration value used by One run ID joins code, HBM, fabric, power, cooling, water, and cost. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `cooling_energy_kwh = None, "water_liters_consumed": None` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 "cost_per_accepted_patch_usd": None,

This line declares `cost_per_accepted_patch_usd = None` as an exact configuration value used by One run ID joins code, HBM, fabric, power, cooling, water, and cost. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `cost_per_accepted_patch_usd = None` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 20 Read this exact line
def join_receipts(receipts: list[Receipt]) -> dict[str, Any]:
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `join_receipts` callable contract used by One run ID joins code, HBM, fabric, power, cooling, water, and cost; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.

What it means on the GPU

Profiler configuration observes rather than selects workload execution units.

How bytes could move

Only a captured, same-run artifact can establish transfers, residency, stalls, or HBM counters; source code alone cannot.

Why this line could matter to useful work

This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · OCWC22

Source path: examples/hbm-learning-journey/nvidia/08-c001-integrated/c001_joined_resource_receipt.py

Revision: e931c19c737266d5575e51cb1d61ac203822614e

C-001 profile python coverage: fixture_backed observation: supported evidence: touchdown_derived
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is One run ID joins code, HBM, fabric, power, cooling, water, and cost.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    The join logic is tested. No live HBM, NIXL, CXL, NVLink, power, cooling, water, or cost receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvml-power-sample Joined power + memory NVML sample (Touchdown teaching fixture) 11 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

Joined power + memory NVML sample (Touchdown teaching fixture)

python

REGISTERED SOURCE · 11 DISPLAYED LINES

docs/content/drafts/2026-07-10-hbm-memory-first-publication-system/fixtures/c001-nvml-power-memory-probe.py

     E01  def main() -> None:
     E02      pynvml.nvmlInit()
     E03      handle = pynvml.nvmlDeviceGetHandleByIndex(0)
     E04      memory = pynvml.nvmlDeviceGetMemoryInfo(handle)
     E05      sample = {
     E06          "timestamp_ns": time.time_ns(),
     E07          "power_w": pynvml.nvmlDeviceGetPowerUsage(handle) / 1000.0,
     E08          "memory_used_bytes": memory.used,
     E09      }
     E10      pynvml.nvmlShutdown()
     E11      print(json.dumps(sample))

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 11 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 def main() -> None:

This line begins the `main` callable contract used by Joined power + memory NVML sample (Touchdown teaching fixture); the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `main` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 pynvml.nvmlInit()

This line initializes the NVML client library before any device telemetry query.

Source
The Python process opens NVML state needed by later handle and metric calls.
Runtime / compiler
It initializes host telemetry access; it does not initialize the model runtime or compile device code.
GPU execution
No GPU execution unit is selected.
Memory path
No capacity, bandwidth, HBM traffic, power, energy, or cost is measured by initialization.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 handle = pynvml.nvmlDeviceGetHandleByIndex(0)

This line resolves GPU index 0 to the NVML device handle used by the later telemetry samples.

Source
The returned opaque handle identifies the parent device for subsequent NVML calls.
Runtime / compiler
This is host-side device selection for telemetry, not serving-engine placement.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
Selecting a device handle does not measure that device's HBM residency, traffic, power, or task attribution.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 memory = pynvml.nvmlDeviceGetMemoryInfo(handle)

This line asks NVML for the selected device's capacity snapshot.

Source
NVML returns total, free, and used memory counters for the device handle.
Runtime / compiler
The host reads telemetry; no allocation or tensor movement is requested.
GPU execution
No GPU execution unit is selected.
Memory path
Used capacity is not bandwidth, per-tensor residency, cache behavior, or HBM read/write bytes.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 sample = {

This line binds or updates `sample = {` for later source in Joined power + memory NVML sample (Touchdown teaching fixture). The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `sample = {` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 "timestamp_ns": time.time_ns(),

This line records a host wall-clock timestamp in nanoseconds beside the telemetry sample.

Source
The timestamp becomes a join key candidate for aligning this record with other host-side events.
Runtime / compiler
It calls the host clock and does not affect model scheduling or compilation.
GPU execution
No GPU execution unit is selected or timed directly.
Memory path
A host timestamp alone does not align GPU clocks or prove HBM traffic, energy, cooling, water, or cost.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 "power_w": pynvml.nvmlDeviceGetPowerUsage(handle) / 1000.0,

This line samples the parent device's instantaneous NVML power reading and converts milliwatts to watts.

Source
The Python binding asks NVML for one power sample from the selected device handle.
Runtime / compiler
The host records telemetry; it does not change model scheduling or compile a kernel.
GPU execution
The sample is device-level telemetry and is not attributed to an SM, tensor core, memory controller, or HBM stack.
Memory path
It is power, not task energy, HBM-only power, cooling, water, or cost; time integration and allocation to the same run are required.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 "memory_used_bytes": memory.used,

This line copies NVML's device-wide used-memory counter into the emitted sample as bytes.

Source
The dictionary stores the `memory.used` snapshot under an explicit unit-bearing key.
Runtime / compiler
It formats already returned telemetry and does not allocate, free, or move a tensor.
GPU execution
The counter is device-wide and is not attributed to one kernel or execution unit.
Memory path
Used capacity is not per-task residency, bandwidth, cache behavior, or HBM read/write bytes.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 pynvml.nvmlShutdown()

This line closes the process's NVML client state after the samples have been collected.

Source
The Python binding releases NVML resources held by the process.
Runtime / compiler
It ends host telemetry access and does not stop the model runtime or reset the GPU.
GPU execution
No GPU execution unit is selected.
Memory path
It releases client state, not model tensors or HBM allocations, and records no traffic or energy.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 print(json.dumps(sample))

This line serializes the joined telemetry dictionary as JSON and writes it to standard output.

Source
json.dumps produces the text record and print emits it for a caller or receipt pipeline.
Runtime / compiler
This is host-side formatting and output after sampling.
GPU execution
No GPU execution unit is selected.
Memory path
The emitted fields remain device snapshots; they are not automatically same-run task energy, HBM traffic, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 11 Read this exact line
def main() -> None:
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `main` callable contract used by Joined power + memory NVML sample (Touchdown teaching fixture); the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Host code can record a sample or compute an allocation after the declared function is executed.

What it means on the GPU

Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.

How bytes could move

Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.

Why this line could matter to useful work

This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · OCWC22

Source path: docs/content/drafts/2026-07-10-hbm-memory-first-publication-system/fixtures/c001-nvml-power-memory-probe.py

Revision: not supplied

C-001 power-cost python coverage: fixture_backed observation: supported evidence: touchdown_derived
Indexed phases: prefillattention-moekernelmemorykvfabricdecodetool-verifypower-cost
No separate source URL registered

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is Joined power + memory NVML sample (Touchdown teaching fixture).
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    This replaces a prior excerpt that did not match any real file in the repository (the previous nvml_sample.py pin measures power+energy only, using 'power_W' capital-W and no memory field at all -- it correctly keeps power and memory separate, so pretending it also reports 'memory_used_bytes' was the actual fabrication). This new c001-nvml-power-memory-probe.py fixture is a genuinely existing, minimal, correct joined pynvml power+memory sample; it has not been executed as part of this publication and is not a C-001 receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

c001-resource-boundary Fail-closed resource and facility boundary 11 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Fail-closed resource and facility boundary

python

REGISTERED SOURCE · 11 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/08-c001-integrated/c001_joined_resource_receipt.py

      57  REQUIRED_RECEIPTS = {
      58      "request": "prompt, task, tool schema, model and tokenizer identity",
      59      "software": "Hermes, engine, model revision, precision tuple and config",
      60      "kernel": "dispatch, executable, architecture, profiler and correctness",
      61      "hbm": "time-aligned read/write bytes and allocator state",
      62      "fabric": "link, source, target, bytes, direction and transfer interval",
      63      "power": "time-aligned device/node/facility meter samples",
      64      "cooling": "declared heat boundary, equipment mode and allocated energy",
      65      "water": "declared site boundary and measured or allocated consumed water",
      66      "cost": "tariff, GPU/capacity allocation, retries and accepted outcome",
      67  }

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 11 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

57 REQUIRED_RECEIPTS = {

This line binds or updates `REQUIRED_RECEIPTS = {` for later source in Fail-closed resource and facility boundary.

Source
The resource-accounting layer uses `REQUIRED_RECEIPTS = {` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
58 "request": "prompt, task, tool schema, model and tokenizer identity",

This line declares `request = "prompt, task, tool schema, model and tokenizer identity"` as an exact configuration value used by Fail-closed resource and facility boundary.

Source
The resource-accounting layer uses `request = "prompt, task, tool schema, model and tokenizer identity"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
59 "software": "Hermes, engine, model revision, precision tuple and config",

This line declares `software = "Hermes, engine, model revision, precision tuple and config"` as an exact configuration value used by Fail-closed resource and facility boundary.

Source
The resource-accounting layer uses `software = "Hermes, engine, model revision, precision tuple and config"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
60 "kernel": "dispatch, executable, architecture, profiler and correctness",

This line declares `kernel = "dispatch, executable, architecture, profiler and correctness"` as an exact configuration value used by Fail-closed resource and facility boundary.

Source
The resource-accounting layer uses `kernel = "dispatch, executable, architecture, profiler and correctness"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
61 "hbm": "time-aligned read/write bytes and allocator state",

This line declares `hbm = "time-aligned read/write bytes and allocator state"` as an exact configuration value used by Fail-closed resource and facility boundary.

Source
The resource-accounting layer uses `hbm = "time-aligned read/write bytes and allocator state"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
62 "fabric": "link, source, target, bytes, direction and transfer interval",

This line declares `fabric = "link, source, target, bytes, direction and transfer interval"` as an exact configuration value used by Fail-closed resource and facility boundary.

Source
The resource-accounting layer uses `fabric = "link, source, target, bytes, direction and transfer interval"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
63 "power": "time-aligned device/node/facility meter samples",

This line declares `power = "time-aligned device/node/facility meter samples"` as an exact configuration value used by Fail-closed resource and facility boundary.

Source
The resource-accounting layer uses `power = "time-aligned device/node/facility meter samples"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
64 "cooling": "declared heat boundary, equipment mode and allocated energy",

This line declares `cooling = "declared heat boundary, equipment mode and allocated energy"` as an exact configuration value used by Fail-closed resource and facility boundary.

Source
The resource-accounting layer uses `cooling = "declared heat boundary, equipment mode and allocated energy"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
65 "water": "declared site boundary and measured or allocated consumed water",

This line declares `water = "declared site boundary and measured or allocated consumed water"` as an exact configuration value used by Fail-closed resource and facility boundary.

Source
The resource-accounting layer uses `water = "declared site boundary and measured or allocated consumed water"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
66 "cost": "tariff, GPU/capacity allocation, retries and accepted outcome",

This line declares `cost = "tariff, GPU/capacity allocation, retries and accepted outcome"` as an exact configuration value used by Fail-closed resource and facility boundary.

Source
The resource-accounting layer uses `cost = "tariff, GPU/capacity allocation, retries and accepted outcome"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
67 }

This line closes the surrounding expression or code block and adds no operation by itself.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 11 Read this exact line
REQUIRED_RECEIPTS = {
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line binds or updates `REQUIRED_RECEIPTS = {` for later source in Fail-closed resource and facility boundary.

What changes next in software

Host code can record a sample or compute an allocation after the declared function is executed.

What it means on the GPU

Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.

How bytes could move

Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.

Why this line could matter to useful work

This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · OCWC22

Source path: examples/hbm-learning-journey/nvidia/08-c001-integrated/c001_joined_resource_receipt.py

Revision: e931c19c737266d5575e51cb1d61ac203822614e

C-001 power-cost python coverage: fixture_backed observation: supported evidence: touchdown_derived
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is Fail-closed resource and facility boundary.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    Code does not determine water or facility cost. Each later boundary requires a joined measurement or declared parent allocation.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

vllm-prefix-cache-manager vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup) 18 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup)

python

REGISTERED SOURCE · 18 DISPLAYED LINES

vllm/v1/core/kv_cache_manager.py

     206      def get_computed_blocks(self, request: Request) -> tuple[KVCacheBlocks, int]:
     207          """Get the computed (cached) blocks for the request.
     208          Note that the computed blocks must be full.
     209
     210          Args:
     211              request: The request to get the computed blocks.
     212
     213          Returns:
     214              A tuple containing:
     215                  - A list of blocks that are computed for the request.
     216                  - The number of computed tokens.
     217          """
     218          # We skip finding the prefix cache hit when prefix caching is
     219          # disabled or the request is marked as skipping kv cache read
     220          # (which happens when the request requires prompt logprobs
     221          # or calls a pooling model with all pooling).
     222          if not self.enable_caching or request.skip_reading_prefix_cache:
     223              return self.empty_kv_cache_blocks, 0

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 18 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

206 def get_computed_blocks(self, request: Request) -> tuple[KVCacheBlocks, int]:

This line begins the `get_computed_blocks` callable contract used by vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup); the body runs only when called.

Source
The engine/control layer uses `get_computed_blocks` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
207 """Get the computed (cached) blocks for the request.

This documentation line explains `Get the computed (cached) blocks for the request.`; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
208 Note that the computed blocks must be full.

This exact expression `Note that the computed blocks must be full.` contributes to the surrounding vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup) statement.

Source
The engine/control layer uses `Note that the computed blocks must be full.` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
209 blank line

This blank line separates logical parts of the excerpt and executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
210 Args:

This continuation line declares or passes `Args:` as part of the surrounding call or signature in vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup).

Source
The engine/control layer uses `Args:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
211 request: The request to get the computed blocks.

This continuation line declares or passes `request: The request to get the computed blocks.` as part of the surrounding call or signature in vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup).

Source
The engine/control layer uses `request: The request to get the computed blocks.` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
212 blank line

This blank line separates logical parts of the excerpt and executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
213 Returns:

This continuation line declares or passes `Returns:` as part of the surrounding call or signature in vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup).

Source
The engine/control layer uses `Returns:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
214 A tuple containing:

This exact expression `A tuple containing:` contributes to the surrounding vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup) statement.

Source
The engine/control layer uses `A tuple containing:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
215 - A list of blocks that are computed for the request.

This exact expression `- A list of blocks that are computed for the request.` contributes to the surrounding vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup) statement.

Source
The engine/control layer uses `- A list of blocks that are computed for the request.` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
216 - The number of computed tokens.

This exact expression `- The number of computed tokens.` contributes to the surrounding vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup) statement.

Source
The engine/control layer uses `- The number of computed tokens.` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
217 """

This documentation line explains ``; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
218 # We skip finding the prefix cache hit when prefix caching is

This comment documents `We skip finding the prefix cache hit when prefix caching is` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
219 # disabled or the request is marked as skipping kv cache read

This comment documents `disabled or the request is marked as skipping kv cache read` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
220 # (which happens when the request requires prompt logprobs

This comment documents `(which happens when the request requires prompt logprobs` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
221 # or calls a pooling model with all pooling).

This comment documents `or calls a pooling model with all pooling).` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
222 if not self.enable_caching or request.skip_reading_prefix_cache:

This line selects a control path using `if not self.enable_caching or request.skip_reading_prefix_cache:` when the surrounding code executes.

Source
The engine/control layer uses `if not self.enable_caching or request.skip_reading_prefix_cache:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
223 return self.empty_kv_cache_blocks, 0

This line returns `return self.empty_kv_cache_blocks, 0` to the caller of the surrounding function.

Source
The engine/control layer uses `return self.empty_kv_cache_blocks, 0` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 18 Read this exact line
def get_computed_blocks(self, request: Request) -> tuple[KVCacheBlocks, int]:
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `get_computed_blocks` callable contract used by vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup); the body runs only when called.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · vllm-project

Source path: vllm/v1/core/kv_cache_manager.py

Revision: 702f4814fe54fabff350d43cb753ae3e47c0c276

C-001 engine python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: prefix

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is vLLM v1 KVCacheManager.get_computed_blocks (real prefix-cache lookup).
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    This is the real upstream vLLM v1 prefix-cache lookup entry point (KVCacheManager.get_computed_blocks), pinned at the v0.25.0 tag. It is source-pinned architecture, not executed as part of this publication; no C-001 prefix-cache hit/miss was captured, and this excerpt does not by itself prove GLM-5.2 dispatched through this exact code path on the pinned platform.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

vllm-mla-attention-kv-boundary vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary) 13 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary)

python

REGISTERED SOURCE · 13 DISPLAYED LINES

vllm/model_executor/layers/attention/mla_attention.py

     339  class MLAAttention(nn.Module, AttentionLayerBase):
     340      """Multi-Head Latent Attention layer.
     341
     342      NOTE: Please read the comment at the top of the file before trying to
     343      understand this class
     344
     345      This class takes query, and compressed key/value tensors as input.
     346      The class does the following:
     347
     348      1. Store the input key and value tensors in the KV cache.
     349      2. Perform (multi-head/multi-query/grouped-query) attention.
     350      3. Return the output tensor.
     351      """

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 13 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

339 class MLAAttention(nn.Module, AttentionLayerBase):

This line begins the `MLAAttention` type used by vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary); its body defines structure and behavior.

Source
The operator layer uses `MLAAttention` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
340 """Multi-Head Latent Attention layer.

This documentation line explains `Multi-Head Latent Attention layer.`; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
341 blank line

This blank line separates logical parts of the excerpt and executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
342 NOTE: Please read the comment at the top of the file before trying to

This continuation line declares or passes `NOTE: Please read the comment at the top of the file before trying to` as part of the surrounding call or signature in vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary).

Source
The operator layer uses `NOTE: Please read the comment at the top of the file before trying to` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
343 understand this class

This exact expression `understand this class` contributes to the surrounding vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary) statement.

Source
The operator layer uses `understand this class` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
344 blank line

This blank line separates logical parts of the excerpt and executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
345 This class takes query, and compressed key/value tensors as input.

This exact expression `This class takes query, and compressed key/value tensors as input.` contributes to the surrounding vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary) statement.

Source
The operator layer uses `This class takes query, and compressed key/value tensors as input.` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
346 The class does the following:

This exact expression `The class does the following:` contributes to the surrounding vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary) statement.

Source
The operator layer uses `The class does the following:` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
347 blank line

This blank line separates logical parts of the excerpt and executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
348 1. Store the input key and value tensors in the KV cache.

This exact expression `1. Store the input key and value tensors in the KV cache.` contributes to the surrounding vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary) statement.

Source
The operator layer uses `1. Store the input key and value tensors in the KV cache.` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
349 2. Perform (multi-head/multi-query/grouped-query) attention.

This line invokes the call chain `Perform` when vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary) executes.

Source
The operator layer uses `Perform` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
350 3. Return the output tensor.

This exact expression `3. Return the output tensor.` contributes to the surrounding vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary) statement.

Source
The operator layer uses `3. Return the output tensor.` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
351 """

This documentation line explains ``; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 13 Read this exact line
class MLAAttention(nn.Module, AttentionLayerBase):
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `MLAAttention` type used by vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary); its body defines structure and behavior.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.

Why this line could matter to useful work

This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · vllm-project

Source path: vllm/model_executor/layers/attention/mla_attention.py

Revision: 702f4814fe54fabff350d43cb753ae3e47c0c276

C-001 operator python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: kv

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is vLLM MLAAttention (real Multi-Head Latent Attention / KV boundary).
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    This is the real upstream vLLM MLA (Multi-Head Latent Attention) layer that GlmMoeDsaForCausalLM inherits via DeepseekV2ForCausalLM, pinned at v0.25.0. It defines the KV-cache write/read boundary for the compressed latent KV representation. Source-pinned only; no C-001 dispatch, KV write, or KV restore was captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

vllm-glm-moe-model-class vLLM GlmMoeDsaForCausalLM class + registry mapping (real engine load path) 5 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

vLLM GlmMoeDsaForCausalLM class + registry mapping (real engine load path)

python

REGISTERED SOURCE · 5 DISPLAYED LINES

vllm/model_executor/models/deepseek_v2.py

     E01  class GlmMoeDsaForCausalLM(DeepseekV2ForCausalLM):
     E02      pass
     E03
     E04  # vllm/model_executor/models/registry.py:116
     E05  "GlmMoeDsaForCausalLM": ("deepseek_v2", "GlmMoeDsaForCausalLM"),

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 5 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 class GlmMoeDsaForCausalLM(DeepseekV2ForCausalLM):

This line begins the `GlmMoeDsaForCausalLM` type used by vLLM GlmMoeDsaForCausalLM class + registry mapping (real engine load path); its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `GlmMoeDsaForCausalLM` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 pass

This exact expression `pass` contributes to the surrounding vLLM GlmMoeDsaForCausalLM class + registry mapping (real engine load path) statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `pass` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # vllm/model_executor/models/registry.py:116

This comment documents `vllm/model_executor/models/registry.py:116` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 "GlmMoeDsaForCausalLM": ("deepseek_v2", "GlmMoeDsaForCausalLM"),

This line declares `GlmMoeDsaForCausalLM = ("deepseek_v2", "GlmMoeDsaForCausalLM")` as an exact configuration value used by vLLM GlmMoeDsaForCausalLM class + registry mapping (real engine load path). The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `GlmMoeDsaForCausalLM = ("deepseek_v2", "GlmMoeDsaForCausalLM")` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 5 Read this exact line
class GlmMoeDsaForCausalLM(DeepseekV2ForCausalLM):
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `GlmMoeDsaForCausalLM` type used by vLLM GlmMoeDsaForCausalLM class + registry mapping (real engine load path); its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.

What it means on the GPU

This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.

How bytes could move

Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.

Why this line could matter to useful work

If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · vllm-project

Source path: vllm/model_executor/models/deepseek_v2.py

Revision: 702f4814fe54fabff350d43cb753ae3e47c0c276

C-001 model python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is vLLM GlmMoeDsaForCausalLM class + registry mapping (real engine load path).
  1. 01 · BEFOREWhat enters

    A pinned checkpoint or configuration plus the workload's model requirements.

  2. 02 · THIS SOURCEWhat role it owns

    Defines model identity, architecture, tensor categories, or precision before an engine can load the workload.

  3. 03 · AFTERWhat leaves

    A model contract that a compatible framework or engine may load; it is not a device launch.

  4. 04 · VALUEWhy anyone cares

    Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

  5. 05 · PROOFWhat is still missing

    Verified on the real vLLM repository at v0.25.0: the architectures field 'GlmMoeDsaForCausalLM' in the pinned zai-org/GLM-5.2-FP8 config.json resolves through vLLM's model registry to a pass-through subclass of DeepseekV2ForCausalLM -- GLM-5.2 loads on vLLM via the DeepSeek-V2 MoE/MLA model family, not a GLM-specific implementation. Registry-only: not bound to a specific C-001 phase because the 'model' tab is already occupied by the pinned HF config artifact in every phase.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the model layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Defines model identity, architecture, tensor categories, or precision before an engine can load the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned checkpoint or configuration plus the workload's model requirements. Output boundary: A model contract that a compatible framework or engine may load; it is not a device launch.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

vllm-moe-fused-routing vLLM FusedMoE (real MoE expert-routing/dispatch entry point) 19 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

vLLM FusedMoE (real MoE expert-routing/dispatch entry point)

python

COMPLETE REGISTERED EXCERPT · 19 DISPLAYED LINES · SOURCE GAP SHOWN

vllm/model_executor/layers/fused_moe/layer.py

     100  def FusedMoE(
     101      num_experts: int,  # Global number of experts
     102      top_k: int,
     103      hidden_size: int,
     104      intermediate_size: int,
     105      intermediate_pad: int | None = None,
     106      params_dtype: torch.dtype | None = None,
     107      renormalize: bool = True,
     108      use_grouped_topk: bool = False,
     109      num_expert_group: int | None = None,
     110      topk_group: int | None = None,
     111      quant_config: QuantizationConfig | None = None,
     112      tp_size: int | None = None,
     113      dp_size: int | None = None,
     114      pcp_size: int | None = None,
     115      prefix: str = "",
     116      custom_routing_function: Callable | None = None,
     117      router: FusedMoERouter | None = None,
  GAP-01      ...

The registered excerpt contains a visible source gap. It is not the whole upstream function or file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 19 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

100 def FusedMoE(

This line begins the `FusedMoE` callable contract used by vLLM FusedMoE (real MoE expert-routing/dispatch entry point); the body runs only when called.

Source
The operator layer uses `FusedMoE` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
101 num_experts: int, # Global number of experts

This continuation line declares or passes `num_experts: int, # Global number of experts` as part of the surrounding call or signature in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `num_experts: int, # Global number of experts` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
102 top_k: int,

This continuation line declares or passes `top_k: int` as part of the surrounding call or signature in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `top_k: int` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
103 hidden_size: int,

This continuation line declares or passes `hidden_size: int` as part of the surrounding call or signature in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `hidden_size: int` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
104 intermediate_size: int,

This continuation line declares or passes `intermediate_size: int` as part of the surrounding call or signature in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `intermediate_size: int` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
105 intermediate_pad: int | None = None,

This line binds or updates `None = None,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `None = None,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
106 params_dtype: torch.dtype | None = None,

This line binds or updates `None = None,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `None = None,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
107 renormalize: bool = True,

This line binds or updates `bool = True,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `bool = True,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
108 use_grouped_topk: bool = False,

This line binds or updates `bool = False,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `bool = False,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
109 num_expert_group: int | None = None,

This line binds or updates `None = None,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `None = None,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
110 topk_group: int | None = None,

This line binds or updates `None = None,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `None = None,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
111 quant_config: QuantizationConfig | None = None,

This line binds or updates `None = None,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `None = None,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
112 tp_size: int | None = None,

This line binds or updates `None = None,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `None = None,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
113 dp_size: int | None = None,

This line binds or updates `None = None,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `None = None,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
114 pcp_size: int | None = None,

This line binds or updates `None = None,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `None = None,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
115 prefix: str = "",

This line binds or updates `str = "",` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `str = "",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
116 custom_routing_function: Callable | None = None,

This line binds or updates `None = None,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `None = None,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
117 router: FusedMoERouter | None = None,

This line binds or updates `None = None,` for later source in vLLM FusedMoE (real MoE expert-routing/dispatch entry point).

Source
The operator layer uses `None = None,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
GAP-01 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 19 Read this exact line
def FusedMoE(
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `FusedMoE` callable contract used by vLLM FusedMoE (real MoE expert-routing/dispatch entry point); the body runs only when called.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · vllm-project

Source path: vllm/model_executor/layers/fused_moe/layer.py

Revision: 702f4814fe54fabff350d43cb753ae3e47c0c276

C-001 operator python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is vLLM FusedMoE (real MoE expert-routing/dispatch entry point).
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Real upstream vLLM MoE routing/dispatch factory (v0.25.0). This is the entry point that would construct GLM-5.2's routed-expert layer (256 routed experts, 8 selected per token per the pinned config). Registry-only: the 'operator' tab is already occupied by flashinfer-shape-probe (attention) in every currently-tested phase and by vllm-mla-attention-kv-boundary in 'kv'; see the generator spec for a recommended future tab split so attention and MoE routing can both be shown without one silently overwriting the other.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

pytorch-sdpa-dispatch PyTorch scaled_dot_product_attention entry and backend choice (v2.13.0) 16 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

PyTorch scaled_dot_product_attention entry and backend choice (v2.13.0)

cpp

1 · THE CALL AN APPLICATION WRITES

out = torch.nn.functional.scaled_dot_product_attention(
    query,
    key,
    value,
    attn_mask=mask,
    dropout_p=0.0,
    is_causal=True,
)

This asks PyTorch for attention. It does not name a CUDA kernel, select a GPU, prove a persistent KV cache, or count HBM bytes.

COMPLETE REGISTERED EXCERPT · 16 DISPLAYED LINES · SOURCE GAP SHOWN

aten/src/ATen/native/transformers/attention.cpp

     715  Tensor scaled_dot_product_attention(
     716      const Tensor& query_,
     717      const Tensor& key,
     718      const Tensor& value,
     719      const std::optional<Tensor>& attn_mask_,
     720      double dropout_p,
     721      bool is_causal,
     722      std::optional<double> scale,
     723      bool enable_gqa) {
     724    using sdp::SDPBackend;
  GAP-01  // ... (empty-input early return elided) ...
     749      choice_int = _fused_sdp_choice_stub(query_.device().type(),
     750            query_, key, value, attn_mask_, dropout_p, is_causal, scale, enable_gqa);
     751    }
     752    const auto query_device_type = query_.device().type();
     753    const auto backend = static_cast<SDPBackend>(choice_int);

The registered excerpt contains a visible source gap. It is not the whole upstream function or file.

CODE → GPU → HBM

PyTorch decides which attention implementation may run

FRAMEWORK REFERENCE · NOT THE ACTIVE GLM-5.2/VLLM MLA PATH · NO GPU RUN CAPTURED

Q is what the current position is asking for. K identifies which positions may match. V contains the information returned from those matches. This C++ excerpt is a switchboard: it passes the tensors and options to a device-specific selector and records the eligible backend. The later backend branch and kernel launch are not included.

  1. Q / K / V already existSOURCE INPUT
  2. PyTorch backend choiceSOURCE FACT
  3. Selected backend and kernelUNKNOWN
  4. L2 / on-chip tiles / HBMPOSSIBLE
  5. Latency / energy / moneyUNMEASURED

Why HBM matters: A fused attention backend can tile Q, K, and V through L2 and on-chip memory and avoid writing the complete attention matrix to HBM. A math path can require more intermediate storage. This excerpt proves neither choice, traffic pattern, nor saving.

KV-cache boundary: Generic SDPA receives K and V tensors. They are not automatically a persistent KV cache. The selected C-001 GLM-5.2 path uses vLLM MLAAttention and compressed latent KV; it does not enter this generic PyTorch card.

LINE-BY-LINE EXPLANATION · 16 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

715 Tensor scaled_dot_product_attention(

This line begins the `scaled_dot_product_attention` callable contract used by PyTorch scaled_dot_product_attention entry and backend choice (v2.13.0); the body runs only when called.

Source
The operator layer uses `scaled_dot_product_attention` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
716 const Tensor& query_,

This signature line declares `query_` as the query tensor whose device, shape, dtype, and strides participate in attention dispatch.

Source
The caller must supply the query tensor whose device, shape, dtype, and strides participate in attention dispatch.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
717 const Tensor& key,

This signature line declares `key` as the key tensor read by the selected attention implementation.

Source
The caller must supply the key tensor read by the selected attention implementation.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
718 const Tensor& value,

This signature line declares `value` as the value tensor combined with attention probabilities.

Source
The caller must supply the value tensor combined with attention probabilities.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
719 const std::optional<Tensor>& attn_mask_,

This signature line declares `attn_mask_` as an optional attention mask that can constrain valid score positions.

Source
The caller must supply an optional attention mask that can constrain valid score positions.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
720 double dropout_p,

This signature line declares `dropout_p` as the requested attention-dropout probability.

Source
The caller must supply the requested attention-dropout probability.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
721 bool is_causal,

This signature line declares `is_causal` as whether the operator must enforce causal masking.

Source
The caller must supply whether the operator must enforce causal masking.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
722 std::optional<double> scale,

This signature line declares `scale` as an optional explicit query-key score scale.

Source
The caller must supply an optional explicit query-key score scale.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
723 bool enable_gqa) {

This signature line declares `enable_gqa` as whether grouped-query-attention handling is enabled.

Source
The caller must supply whether grouped-query-attention handling is enabled.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
724 using sdp::SDPBackend;

This C++ using-declaration brings PyTorch's `sdp::SDPBackend` enum into the local scope.

Source
Later lines can write `SDPBackend` without repeating the `sdp::` namespace qualifier.
Runtime / compiler
This is compile-time name resolution; it does not choose an attention backend.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
The alias changes no tensor, temporary storage, cache behavior, or HBM traffic.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
GAP-01 // ... (empty-input early return elided) ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
749 choice_int = _fused_sdp_choice_stub(query_.device().type(),

This PyTorch dispatcher asks the active device backend to choose the scaled-dot-product-attention implementation for these tensors and options.

Source
The call passes device type, query, key, value, mask, dropout, causal, scale, and grouped-query settings to the backend-choice stub.
Runtime / compiler
The returned enum controls a later math, flash, memory-efficient, or vendor attention path.
GPU execution
No kernel, CTA, warp, SM, CU, or tensor-core path is identified until the returned backend is dispatched.
Memory path
Backend choice can change temporary storage and tensor traffic, but addresses, cache outcomes, and HBM bytes are not in this line.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
750 query_, key, value, attn_mask_, dropout_p, is_causal, scale, enable_gqa);

This exact expression `query_, key, value, attn_mask_, dropout_p, is_causal, scale, enable_gqa);` contributes to the surrounding PyTorch scaled_dot_product_attention entry and backend choice (v2.13.0) statement.

Source
The operator layer uses `query_, key, value, attn_mask_, dropout_p, is_causal, scale, enable_gqa);` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
751 }

This line closes the surrounding expression or code block and adds no operation by itself.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
752 const auto query_device_type = query_.device().type();

This line reads the query tensor's device category and stores it in `query_device_type` for backend dispatch.

Source
The tensor metadata call returns a CPU, CUDA, or other registered device type.
Runtime / compiler
Later control flow can use the device category to select a backend implementation.
GPU execution
Reading tensor metadata does not select the final attention kernel or GPU execution unit.
Memory path
It reads metadata, not query contents, and proves no cache outcome or HBM byte count.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
753 const auto backend = static_cast<SDPBackend>(choice_int);

This line converts the integer returned by the backend-choice stub into the typed `SDPBackend` enum.

Source
The typed value stored in `backend` is used by the following dispatch control flow.
Runtime / compiler
The cast itself is host C++ bookkeeping; the later branch performs backend selection.
GPU execution
No attention kernel or GPU execution unit is launched by the cast.
Memory path
The cast moves no tensor data and proves no temporary-storage, cache, or HBM behavior.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 16 Read this exact line
Tensor scaled_dot_product_attention(
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `scaled_dot_product_attention` callable contract used by PyTorch scaled_dot_product_attention entry and backend choice (v2.13.0); the body runs only when called.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.

Why this line could matter to useful work

This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · pytorch

Source path: aten/src/ATen/native/transformers/attention.cpp

Revision: cf30153c4c131c8164ee7798e5022d810682e2cb

C-001 operator cpp coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cpp excerpt belongs to C-001 coding-agent walkthrough. Its registered role is PyTorch scaled_dot_product_attention entry and backend choice (v2.13.0).
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    This is the general PyTorch eager attention entry: a per-device stub picks cuDNN, flash, efficient, or math backends at call time. The selected vLLM C-001 trace uses vLLM's own MLAAttention layer, not this entry; this pin shows the framework-layer branch point, not a proven C-001 dispatch.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

pytorch-compile-fx torch.compile Inductor entry point compile_fx (v2.13.0) 17 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

torch.compile Inductor entry point compile_fx (v2.13.0)

python

REGISTERED SOURCE · 17 DISPLAYED LINES

torch/_inductor/compile_fx.py

     E01  def compile_fx(
     E02      model_: GraphModule,
     E03      example_inputs_: Sequence[InputType],
     E04      inner_compile: Callable[..., OutputCode] = compile_fx_inner,
     E05      config_patches: dict[str, Any] | None = None,
     E06      decompositions: dict[OpOverload, Callable[..., Any]] | None = None,
     E07      ignore_shape_env: bool = False,
     E08      compile_region_name: str | None = None,
     E09  ) -> CompileFxOutput:
     E10      """
     E11      Main entry point for compiling given FX graph.  Despite the fact that this
     E12      lives in :mod:`torch._inductor`, this function is responsible for calling
     E13      into AOT Autograd (and we will eventually get a callback to
     E14      ``inner_compile`` to perform actual compilation.  In other words, this
     E15      function orchestrates end-to-end compilation for the inductor backend when
     E16      you use :func:`torch.compile`.
     E17      """

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 17 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 def compile_fx(

This line begins the `compile_fx` callable contract used by torch.compile Inductor entry point compile_fx (v2.13.0); the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `compile_fx` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 model_: GraphModule,

This continuation line declares or passes `model_: GraphModule` as part of the surrounding call or signature in torch.compile Inductor entry point compile_fx (v2.13.0). The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `model_: GraphModule` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 example_inputs_: Sequence[InputType],

This continuation line declares or passes `example_inputs_: Sequence[InputType]` as part of the surrounding call or signature in torch.compile Inductor entry point compile_fx (v2.13.0). The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `example_inputs_: Sequence[InputType]` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 inner_compile: Callable[..., OutputCode] = compile_fx_inner,

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 config_patches: dict[str, Any] | None = None,

This line binds or updates `None = None,` for later source in torch.compile Inductor entry point compile_fx (v2.13.0). The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `None = None,` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 decompositions: dict[OpOverload, Callable[..., Any]] | None = None,

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 ignore_shape_env: bool = False,

This line binds or updates `bool = False,` for later source in torch.compile Inductor entry point compile_fx (v2.13.0). The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `bool = False,` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 compile_region_name: str | None = None,

This line binds or updates `None = None,` for later source in torch.compile Inductor entry point compile_fx (v2.13.0). The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `None = None,` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 ) -> CompileFxOutput:

This exact expression `) -> CompileFxOutput:` contributes to the surrounding torch.compile Inductor entry point compile_fx (v2.13.0) statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `) -> CompileFxOutput:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 """

This documentation line explains ``; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 Main entry point for compiling given FX graph. Despite the fact that this

This exact expression `Main entry point for compiling given FX graph. Despite the fact that this` contributes to the surrounding torch.compile Inductor entry point compile_fx (v2.13.0) statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `Main entry point for compiling given FX graph. Despite the fact that this` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 lives in :mod:`torch._inductor`, this function is responsible for calling

This exact expression `lives in :mod:`torch._inductor`, this function is responsible for calling` contributes to the surrounding torch.compile Inductor entry point compile_fx (v2.13.0) statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `lives in :mod:`torch._inductor`, this function is responsible for calling` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 into AOT Autograd (and we will eventually get a callback to

This line invokes the call chain `Autograd` when torch.compile Inductor entry point compile_fx (v2.13.0) executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `Autograd` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 ``inner_compile`` to perform actual compilation. In other words, this

This exact expression ```inner_compile`` to perform actual compilation. In other words, this` contributes to the surrounding torch.compile Inductor entry point compile_fx (v2.13.0) statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses ```inner_compile`` to perform actual compilation. In other words, this` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 function orchestrates end-to-end compilation for the inductor backend when

This exact expression `function orchestrates end-to-end compilation for the inductor backend when` contributes to the surrounding torch.compile Inductor entry point compile_fx (v2.13.0) statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `function orchestrates end-to-end compilation for the inductor backend when` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 you use :func:`torch.compile`.

This exact expression `you use :func:`torch.compile`.` contributes to the surrounding torch.compile Inductor entry point compile_fx (v2.13.0) statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `you use :func:`torch.compile`.` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 """

This documentation line explains ``; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 17 Read this exact line
def compile_fx(
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `compile_fx` callable contract used by torch.compile Inductor entry point compile_fx (v2.13.0); the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · pytorch

Source path: torch/_inductor/compile_fx.py

Revision: cf30153c4c131c8164ee7798e5022d810682e2cb

C-001 engine python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is torch.compile Inductor entry point compile_fx (v2.13.0).
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    This is the real TorchDynamo-to-Inductor compile entry behind torch.compile. Whether the selected vLLM C-001 trace compiles any region through Inductor (versus eager, CUDA graphs, or custom ops) is engine-configuration dependent and is not proven here.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

vllm-triton-unified-attention vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0) 14 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0)

python

REGISTERED SOURCE · 14 DISPLAYED LINES

vllm/v1/attention/ops/triton_unified_attention.py

     178  @triton.jit
     179  def kernel_unified_attention(
     180      # Output destination for the 2D path.  In 3D mode per-segment partials
     181      # go to the ``segm_*`` tensors (see bottom of signature) and
     182      # ``output_ptr`` is unused (callers may pass any non-null pointer).
     183      output_ptr,
     184      # Inputs
     185      query_ptr,
     186      key_cache_ptr,
     187      value_cache_ptr,
     188      sink_ptr,
     189      block_tables_ptr,
     190      seq_lens_ptr,
     191      alibi_slopes_ptr,

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 14 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

178 @triton.jit

This line attaches `triton.jit` metadata or compilation behavior to the definition that follows.

Source
The kernel source uses `triton.jit` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
179 def kernel_unified_attention(

This line begins the `kernel_unified_attention` callable contract used by vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0); the body runs only when called.

Source
The kernel source uses `kernel_unified_attention` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
180 # Output destination for the 2D path. In 3D mode per-segment partials

This comment documents `Output destination for the 2D path. In 3D mode per-segment partials` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
181 # go to the ``segm_*`` tensors (see bottom of signature) and

This comment documents `go to the ``segm_*`` tensors (see bottom of signature) and` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
182 # ``output_ptr`` is unused (callers may pass any non-null pointer).

This comment documents ```output_ptr`` is unused (callers may pass any non-null pointer).` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
183 output_ptr,

This exact expression `output_ptr,` contributes to the surrounding vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0) statement.

Source
The kernel source uses `output_ptr,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
184 # Inputs

This comment documents `Inputs` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
185 query_ptr,

This exact expression `query_ptr,` contributes to the surrounding vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0) statement.

Source
The kernel source uses `query_ptr,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
186 key_cache_ptr,

This exact expression `key_cache_ptr,` contributes to the surrounding vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0) statement.

Source
The kernel source uses `key_cache_ptr,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
187 value_cache_ptr,

This exact expression `value_cache_ptr,` contributes to the surrounding vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0) statement.

Source
The kernel source uses `value_cache_ptr,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
188 sink_ptr,

This exact expression `sink_ptr,` contributes to the surrounding vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0) statement.

Source
The kernel source uses `sink_ptr,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
189 block_tables_ptr,

This exact expression `block_tables_ptr,` contributes to the surrounding vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0) statement.

Source
The kernel source uses `block_tables_ptr,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
190 seq_lens_ptr,

This exact expression `seq_lens_ptr,` contributes to the surrounding vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0) statement.

Source
The kernel source uses `seq_lens_ptr,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
191 alibi_slopes_ptr,

This exact expression `alibi_slopes_ptr,` contributes to the surrounding vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0) statement.

Source
The kernel source uses `alibi_slopes_ptr,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 14 Read this exact line
@triton.jit
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line attaches `triton.jit` metadata or compilation behavior to the definition that follows.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.

Why this line could matter to useful work

This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · vllm-project

Source path: vllm/v1/attention/ops/triton_unified_attention.py

Revision: 702f4814fe54fabff350d43cb753ae3e47c0c276

C-001 kernel python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is vLLM Triton unified attention kernel (real @triton.jit source, v0.25.0).
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    A real Triton attention kernel inside the selected engine repository at the pinned v0.25.0 revision. Living in the engine is not selection proof: the attention backend actually chosen for GLM-5.2 MLA on the pinned platform is decided at runtime and no C-001 dispatch is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cutlass-blackwell-mla-example CUTLASS Blackwell MLA inference kernel example (v4.5.1) 5 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

CUTLASS Blackwell MLA inference kernel example (v4.5.1)

cuda

COMPLETE REGISTERED EXCERPT · 5 DISPLAYED LINES · SOURCE GAP SHOWN

examples/77_blackwell_fmha/77_blackwell_mla.cu

      31  /*! \file A MLA (Multi-Head Latent Attention) inference kernel sample for the
      32            NVIDIA Blackwell Architecture.
      33  */
  GAP-01  // ... (kernel/collective setup elided) ...
     315    using Operation = cutlass::fmha::device::MLA<Kernel>;

The registered excerpt contains a visible source gap. It is not the whole upstream function or file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 5 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

31 /*! \file A MLA (Multi-Head Latent Attention) inference kernel sample for the

This comment documents `! \file A MLA (Multi-Head Latent Attention) inference kernel sample for the` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
32 NVIDIA Blackwell Architecture.

This exact expression `NVIDIA Blackwell Architecture.` contributes to the surrounding CUTLASS Blackwell MLA inference kernel example (v4.5.1) statement.

Source
The kernel source uses `NVIDIA Blackwell Architecture.` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
33 */

This comment documents `` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
GAP-01 // ... (kernel/collective setup elided) ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
315 using Operation = cutlass::fmha::device::MLA<Kernel>;

This line binds or updates `Operation = cutlass::fmha::device::MLA<Kernel>` for later source in CUTLASS Blackwell MLA inference kernel example (v4.5.1).

Source
The kernel source uses `Operation = cutlass::fmha::device::MLA<Kernel>` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 5 Read this exact line
/*! \file A MLA (Multi-Head Latent Attention) inference kernel sample for the
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `! \file A MLA (Multi-Head Latent Attention) inference kernel sample for the` for the reader; it executes nothing.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · NVIDIA

Source path: examples/77_blackwell_fmha/77_blackwell_mla.cu

Revision: 2e602843e75100d0e03934efb386b3e1e35d7907

C-001 kernel cuda coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: attention-moe

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to C-001 coding-agent walkthrough. Its registered role is CUTLASS Blackwell MLA inference kernel example (v4.5.1).
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    NVIDIA's own CUTLASS example of an MLA inference kernel for the exact active platform generation (Blackwell) and the exact attention family GLM-5.2 uses. It demonstrates that a template-library MLA path exists at this layer; it is not the kernel vLLM dispatches for C-001 and no execution is claimed.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

flashinfer-paged-prefill-kernel FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14) 9 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14)

cuda

COMPLETE REGISTERED EXCERPT · 9 DISPLAYED LINES · SOURCE GAP SHOWN

include/flashinfer/attention/prefill.cuh

    3408  template <typename KTraits, typename Params>
    3409  __global__ __launch_bounds__(KTraits::NUM_THREADS) void BatchPrefillWithPagedKVCacheKernel(
    3410      const __grid_constant__ Params params) {
    3411    extern __shared__ uint8_t smem[];
    3412    auto& smem_storage = reinterpret_cast<typename KTraits::SharedStoragePaged&>(smem);
    3413    BatchPrefillWithPagedKVCacheDevice<KTraits>(params, smem_storage);
  GAP-01  // ... (dispatch macro selects KernelTraits, then:) ...
    3718        size_t smem_size = sizeof(typename KTraits::SharedStoragePaged);
    3719        auto kernel = BatchPrefillWithPagedKVCacheKernel<KTraits, Params>;

The registered excerpt contains a visible source gap. It is not the whole upstream function or file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 9 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

3408 template <typename KTraits, typename Params>

This exact expression `template <typename KTraits, typename Params>` contributes to the surrounding FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14) statement.

Source
The kernel source uses `template <typename KTraits, typename Params>` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
3409 __global__ __launch_bounds__(KTraits::NUM_THREADS) void BatchPrefillWithPagedKVCacheKernel(

This line begins the `__launch_bounds__` callable contract used by FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14); the body runs only when called.

Source
The kernel source uses `__launch_bounds__` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
3410 const __grid_constant__ Params params) {

This exact expression `const __grid_constant__ Params params) {` contributes to the surrounding FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14) statement.

Source
The kernel source uses `const __grid_constant__ Params params) {` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
3411 extern __shared__ uint8_t smem[];

This exact expression `extern __shared__ uint8_t smem[];` contributes to the surrounding FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14) statement.

Source
The kernel source uses `extern __shared__ uint8_t smem[];` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
3412 auto& smem_storage = reinterpret_cast<typename KTraits::SharedStoragePaged&>(smem);

This line calls `reinterpret_cast<typename KTraits::SharedStoragePaged&>(...)` and binds its returned value to `smem_storage` for later use in FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14).

Source
The kernel source uses `smem_storage ← reinterpret_cast<typename KTraits::SharedStoragePaged&>(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
3413 BatchPrefillWithPagedKVCacheDevice<KTraits>(params, smem_storage);

This exact expression `BatchPrefillWithPagedKVCacheDevice<KTraits>(params, smem_storage);` contributes to the surrounding FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14) statement.

Source
The kernel source uses `BatchPrefillWithPagedKVCacheDevice<KTraits>(params, smem_storage);` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
GAP-01 // ... (dispatch macro selects KernelTraits, then:) ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
3718 size_t smem_size = sizeof(typename KTraits::SharedStoragePaged);

This line calls `sizeof(...)` and binds its returned value to `smem_size` for later use in FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14).

Source
The kernel source uses `smem_size ← sizeof(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
3719 auto kernel = BatchPrefillWithPagedKVCacheKernel<KTraits, Params>;

This line binds or updates `kernel = BatchPrefillWithPagedKVCacheKernel<KTraits, Params>` for later source in FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14).

Source
The kernel source uses `kernel = BatchPrefillWithPagedKVCacheKernel<KTraits, Params>` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 9 Read this exact line
template <typename KTraits, typename Params>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This exact expression `template <typename KTraits, typename Params>` contributes to the surrounding FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14) statement.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · flashinfer-ai

Source path: include/flashinfer/attention/prefill.cuh

Revision: 19f1a41e6b21f0c422d775e377b6fdf9a1fc9d23

C-001 kernel cuda coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to C-001 coding-agent walkthrough. Its registered role is FlashInfer paged-KV prefill CUDA kernel and launch site (v0.6.14).
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    The real device kernel behind the FlashInfer prefill API that the existing flashinfer-shape-probe fixture calls: a __global__ kernel over paged KV with compile-time KernelTraits and an explicit shared-memory budget check. Source-pinned only; no C-001 launch of this kernel is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cublaslt-ltsgemm-sample cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples) 11 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples)

cuda

COMPLETE REGISTERED EXCERPT · 11 DISPLAYED LINES · SOURCE GAP SHOWN

cuBLASLt/LtSgemm/sample_cublasLt_LtSgemm.cu

     E01  void LtSgemm(cublasLtHandle_t ltHandle,
     E02               cublasOperation_t transa,
     E03               cublasOperation_t transb,
     E04               int m,
     E05               int n,
     E06               int k,
     E07  // ... (descriptor setup elided) ...
     E08      // we just need the best available heuristic to try and run matmul. There is no guarantee this will work, e.g. if A
     E09      // is badly aligned, you can request more (e.g. 32) algos and try to run them one by one until something works
     E10      checkCublasStatus(cublasLtMatmulAlgoGetHeuristic(ltHandle, operationDesc, Adesc, Bdesc, Cdesc, Cdesc, preference, 1,
     E11                                                       &heuristicResult, &returnedResults));

The registered excerpt contains a visible source gap. It is not the whole upstream function or file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 11 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 void LtSgemm(cublasLtHandle_t ltHandle,

This line begins the `LtSgemm` callable contract used by cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples); the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `LtSgemm` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 cublasOperation_t transa,

This exact expression `cublasOperation_t transa,` contributes to the surrounding cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples) statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasOperation_t transa,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 cublasOperation_t transb,

This exact expression `cublasOperation_t transb,` contributes to the surrounding cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples) statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasOperation_t transb,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 int m,

This continuation line declares or passes `m: int` as part of the surrounding call or signature in cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples). The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `m: int` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 int n,

This continuation line declares or passes `n: int` as part of the surrounding call or signature in cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples). The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `n: int` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 int k,

This continuation line declares or passes `k: int` as part of the surrounding call or signature in cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples). The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `k: int` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 // ... (descriptor setup elided) ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 // we just need the best available heuristic to try and run matmul. There is no guarantee this will work, e.g. if A

This comment documents `we just need the best available heuristic to try and run matmul. There is no guarantee …` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 // is badly aligned, you can request more (e.g. 32) algos and try to run them one by one until something works

This comment documents `is badly aligned, you can request more (e.g. 32) algos and try to run them one by one u…` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 checkCublasStatus(cublasLtMatmulAlgoGetHeuristic(ltHandle, operationDesc, Adesc, Bdesc, Cdesc, Cdesc, preference, 1,

This line invokes the call chain `checkCublasStatus → cublasLtMatmulAlgoGetHeuristic` when cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples) executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `checkCublasStatus → cublasLtMatmulAlgoGetHeuristic` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 &heuristicResult, &returnedResults));

This exact expression `&heuristicResult, &returnedResults));` contributes to the surrounding cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples) statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `&heuristicResult, &returnedResults));` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 11 Read this exact line
void LtSgemm(cublasLtHandle_t ltHandle,
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `LtSgemm` callable contract used by cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples); the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · NVIDIA

Source path: cuBLASLt/LtSgemm/sample_cublasLt_LtSgemm.cu

Revision: eebf73ab76867329c2bb42f6329845db0abfe31c

C-001 operator cuda coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to C-001 coding-agent walkthrough. Its registered role is cuBLASLt LtSgemm sample: heuristic selection then matmul (NVIDIA samples).
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Official NVIDIA sample showing the cuBLASLt shape every GEMM user rides: build descriptors, ask the heuristic for an algorithm, then launch cublasLtMatmul. Pinned to the repository head commit at access date because CUDALibrarySamples does not tag releases per-sample. Not a GLM-5.2 GEMM dispatch.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

tilelang-mla-decode-example TileLang MLA decode kernel example (v0.1.12) 11 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

TileLang MLA decode kernel example (v0.1.12)

python

REGISTERED SOURCE · 11 DISPLAYED LINES

examples/deepseek_mla/example_mla_decode.py

      10  @tilelang.jit(
      11      out_idx=[4],
      12      pass_configs={tilelang.PassConfigKey.TL_ENABLE_FAST_MATH: True},
      13  )
      14  def flashattn(batch, heads, kv_head_num, seqlen_kv, dim, pe_dim, block_N, block_H, num_split, softmax_scale):
      15      scale = float(softmax_scale * 1.44269504)  # log2(e)
      16      dtype = T.float16
      17      accum_dtype = T.float32
      18      kv_group_num = heads // kv_head_num
      19      VALID_BLOCK_H = min(block_H, kv_group_num)
      20      assert kv_head_num == 1, "kv_head_num must be 1"

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 11 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

10 @tilelang.jit(

This line attaches `tilelang.jit` metadata or compilation behavior to the definition that follows.

Source
The kernel source uses `tilelang.jit` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
11 out_idx=[4],

This line binds or updates `out_idx = [4],` for later source in TileLang MLA decode kernel example (v0.1.12).

Source
The kernel source uses `out_idx = [4],` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
12 pass_configs={tilelang.PassConfigKey.TL_ENABLE_FAST_MATH: True},

This line binds or updates `pass_configs = {tilelang.PassConfigKey.TL_ENABLE_FAST_MATH: True},` for later source in TileLang MLA decode kernel example (v0.1.12).

Source
The kernel source uses `pass_configs = {tilelang.PassConfigKey.TL_ENABLE_FAST_MATH: True},` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
13 )

This line closes the surrounding expression or code block and adds no operation by itself.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
14 def flashattn(batch, heads, kv_head_num, seqlen_kv, dim, pe_dim, block_N, block_H, num_split, softmax_scale):

This line begins the `flashattn` callable contract used by TileLang MLA decode kernel example (v0.1.12); the body runs only when called.

Source
The kernel source uses `flashattn` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
15 scale = float(softmax_scale * 1.44269504) # log2(e)

This line calls `float(...)` and binds its returned value to `scale` for later use in TileLang MLA decode kernel example (v0.1.12).

Source
The kernel source uses `scale ← float(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
16 dtype = T.float16

This line binds or updates `dtype = T.float16` for later source in TileLang MLA decode kernel example (v0.1.12).

Source
The kernel source uses `dtype = T.float16` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
17 accum_dtype = T.float32

This line binds or updates `accum_dtype = T.float32` for later source in TileLang MLA decode kernel example (v0.1.12).

Source
The kernel source uses `accum_dtype = T.float32` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
18 kv_group_num = heads // kv_head_num

This line binds or updates `kv_group_num = heads // kv_head_num` for later source in TileLang MLA decode kernel example (v0.1.12).

Source
The kernel source uses `kv_group_num = heads // kv_head_num` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
19 VALID_BLOCK_H = min(block_H, kv_group_num)

This line calls `min(...)` and binds its returned value to `VALID_BLOCK_H` for later use in TileLang MLA decode kernel example (v0.1.12).

Source
The kernel source uses `VALID_BLOCK_H ← min(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
20 assert kv_head_num == 1, "kv_head_num must be 1"

This line enforces `assert kv_head_num == 1, "kv_head_num must be 1"` and stops or rejects the path when the condition fails.

Source
The kernel source uses `assert kv_head_num == 1, "kv_head_num must be 1"` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 11 Read this exact line
@tilelang.jit(
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line attaches `tilelang.jit` metadata or compilation behavior to the definition that follows.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.

Why this line could matter to useful work

This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · tile-ai

Source path: examples/deepseek_mla/example_mla_decode.py

Revision: 2d63708c8ad57196051c4636a1167c5453c73a48

C-001 kernel python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is TileLang MLA decode kernel example (v0.1.12).
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    A real TileLang DSL kernel for MLA decode (DeepSeek-family latent attention, the same attention family as GLM-5.2), with explicit per-tensor dtypes in source: float16 storage, float32 accumulation. It is an alternative kernel-DSL implementation, not on the selected vLLM trace, and never executed here.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

gluon-tutorial-copy-kernel Gluon @gluon.jit kernel from the official Triton tutorial (v3.7.1) 11 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Gluon @gluon.jit kernel from the official Triton tutorial (v3.7.1)

python

REGISTERED SOURCE · 11 DISPLAYED LINES

python/tutorials/gluon/01-intro.py

      42  from triton.experimental import gluon
      43  from triton.experimental.gluon import language as gl
      44
      45  # %%
      46  # We illustrate this with a trivial kernel that copies a scalar.
      47
      48
      49  @gluon.jit
      50  def copy_scalar_kernel(in_ptr, out_ptr):
      51      value = gl.load(in_ptr)
      52      gl.store(out_ptr, value)

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 11 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

42 from triton.experimental import gluon

This line imports `from triton.experimental import gluon` so later source can reference it; importing does not run the workload operation.

Source
The kernel source uses `from triton.experimental import gluon` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
43 from triton.experimental.gluon import language as gl

This line imports `from triton.experimental.gluon import language as gl` so later source can reference it; importing does not run the workload operation.

Source
The kernel source uses `from triton.experimental.gluon import language as gl` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
44 blank line

This blank line separates logical parts of the excerpt and executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
45 # %%

This comment documents `%%` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
46 # We illustrate this with a trivial kernel that copies a scalar.

This comment documents `We illustrate this with a trivial kernel that copies a scalar.` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
47 blank line

This blank line separates logical parts of the excerpt and executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
48 blank line

This blank line separates logical parts of the excerpt and executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
49 @gluon.jit

This line attaches `gluon.jit` metadata or compilation behavior to the definition that follows.

Source
The kernel source uses `gluon.jit` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
50 def copy_scalar_kernel(in_ptr, out_ptr):

This line begins the `copy_scalar_kernel` callable contract used by Gluon @gluon.jit kernel from the official Triton tutorial (v3.7.1); the body runs only when called.

Source
The kernel source uses `copy_scalar_kernel` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
51 value = gl.load(in_ptr)

This Gluon kernel line loads the value addressed by in_ptr into a program value.

Source
The DSL represents a device-side load from the pointer operand.
Runtime / compiler
Gluon/Triton lowering turns the load into target-specific device instructions if the kernel is compiled.
GPU execution
A launched program instance would issue the load from GPU threads; the exact warp, SM, and instruction are not captured.
Memory path
The access may hit a cache or reach device memory/HBM; address, width, cache outcome, and bytes require compilation and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
52 gl.store(out_ptr, value)

This Gluon kernel line stores the program value to the address carried by out_ptr.

Source
The DSL represents a device-side store to the pointer operand.
Runtime / compiler
Gluon/Triton lowering emits target-specific store instructions if the kernel is compiled.
GPU execution
A launched program instance would issue the store; exact warp, SM, and instruction are not captured.
Memory path
The write may pass through cache and eventually device memory/HBM; address, width, writeback behavior, and bytes require a run.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 11 Read this exact line
from triton.experimental import gluon
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line imports `from triton.experimental import gluon` so later source can reference it; importing does not run the workload operation.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · triton-lang

Source path: python/tutorials/gluon/01-intro.py

Revision: f797708c0626e5f9840ca5b0a98790e2c7cb09ad

C-001 kernel python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is Gluon @gluon.jit kernel from the official Triton tutorial (v3.7.1).
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Gluon is Triton's lower-level, layout-explicit kernel language (triton.experimental.gluon), pinned at Triton v3.7.1 where the official tutorial series exists. This is the smallest official kernel; no GLM-5.2 operator is implemented in Gluon on the selected trace.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

helion-attention-example Helion @helion.kernel attention example (v1.2.0) 9 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Helion @helion.kernel attention example (v1.2.0)

python

REGISTERED SOURCE · 9 DISPLAYED LINES

examples/attention.py

      36  @helion.kernel(
      37      # Static shapes provides a speedup for attention
      38      static_shapes=True,
      39  )
      40  def attention(
      41      q_in: torch.Tensor,
      42      k_in: torch.Tensor,
      43      v_in: torch.Tensor,
      44  ) -> tuple[torch.Tensor, torch.Tensor]:

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 9 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

36 @helion.kernel(

This line attaches `helion.kernel` metadata or compilation behavior to the definition that follows.

Source
The kernel source uses `helion.kernel` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
37 # Static shapes provides a speedup for attention

This comment documents `Static shapes provides a speedup for attention` for the reader; it executes nothing.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
38 static_shapes=True,

This line binds or updates `static_shapes = True,` for later source in Helion @helion.kernel attention example (v1.2.0).

Source
The kernel source uses `static_shapes = True,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
39 )

This line closes the surrounding expression or code block and adds no operation by itself.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
40 def attention(

This line begins the `attention` callable contract used by Helion @helion.kernel attention example (v1.2.0); the body runs only when called.

Source
The kernel source uses `attention` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
41 q_in: torch.Tensor,

This continuation line declares or passes `q_in: torch.Tensor` as part of the surrounding call or signature in Helion @helion.kernel attention example (v1.2.0).

Source
The kernel source uses `q_in: torch.Tensor` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
42 k_in: torch.Tensor,

This continuation line declares or passes `k_in: torch.Tensor` as part of the surrounding call or signature in Helion @helion.kernel attention example (v1.2.0).

Source
The kernel source uses `k_in: torch.Tensor` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
43 v_in: torch.Tensor,

This continuation line declares or passes `v_in: torch.Tensor` as part of the surrounding call or signature in Helion @helion.kernel attention example (v1.2.0).

Source
The kernel source uses `v_in: torch.Tensor` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
44 ) -> tuple[torch.Tensor, torch.Tensor]:

This exact expression `) -> tuple[torch.Tensor, torch.Tensor]:` contributes to the surrounding Helion @helion.kernel attention example (v1.2.0) statement.

Source
The kernel source uses `) -> tuple[torch.Tensor, torch.Tensor]:` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 9 Read this exact line
@helion.kernel(
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line attaches `helion.kernel` metadata or compilation behavior to the definition that follows.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: C-001 coding-agent walkthrough · pytorch

Source path: examples/attention.py

Revision: d55389be89e013b86f09b70d0680dee8ecaf8c7f

C-001 kernel python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to C-001 coding-agent walkthrough. Its registered role is Helion @helion.kernel attention example (v1.2.0).
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Helion (pytorch/helion) compiles PyTorch-like kernel code through Triton. This official attention example shows the higher-level authoring layer above Triton; it is an alternative implementation family, not on the selected vLLM trace, and never executed here.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for C-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-expert-config Wan2.2 A14B expert boundary 4 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

Wan2.2 A14B expert boundary

python

REGISTERED SOURCE · 4 DISPLAYED LINES

Source path not registered

     E01  t2v_A14B.low_noise_checkpoint = 'low_noise_model'
     E02  t2v_A14B.high_noise_checkpoint = 'high_noise_model'
     E03  t2v_A14B.boundary = 0.875
     E04  t2v_A14B.sample_guide_scale = (3.0, 4.0)

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 4 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 t2v_A14B.low_noise_checkpoint = 'low_noise_model'

This line binds or updates `t2v_A14B.low_noise_checkpoint = 'low_noise_model'` for later source in Wan2.2 A14B expert boundary. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `t2v_A14B.low_noise_checkpoint = 'low_noise_model'` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 t2v_A14B.high_noise_checkpoint = 'high_noise_model'

This line binds or updates `t2v_A14B.high_noise_checkpoint = 'high_noise_model'` for later source in Wan2.2 A14B expert boundary. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `t2v_A14B.high_noise_checkpoint = 'high_noise_model'` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 t2v_A14B.boundary = 0.875

This line binds or updates `t2v_A14B.boundary = 0.875` for later source in Wan2.2 A14B expert boundary. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `t2v_A14B.boundary = 0.875` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 t2v_A14B.sample_guide_scale = (3.0, 4.0)

This line binds or updates `t2v_A14B.sample_guide_scale = (3.0, 4.0)` for later source in Wan2.2 A14B expert boundary. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `t2v_A14B.sample_guide_scale = (3.0, 4.0)` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 4 Read this exact line
t2v_A14B.low_noise_checkpoint = 'low_noise_model'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line binds or updates `t2v_A14B.low_noise_checkpoint = 'low_noise_model'` for later source in Wan2.2 A14B expert boundary. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.

What it means on the GPU

This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.

How bytes could move

It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.

Why this line could matter to useful work

This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 model python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: clip-contractexpert-selectqkv-attentionulysses-fsdpconditional-passesguidancescheduler-steprepeat-denoise

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is Wan2.2 A14B expert boundary.
  1. 01 · BEFOREWhat enters

    A pinned checkpoint or configuration plus the workload's model requirements.

  2. 02 · THIS SOURCEWhat role it owns

    Defines model identity, architecture, tensor categories, or precision before an engine can load the workload.

  3. 03 · AFTERWhat leaves

    A model contract that a compatible framework or engine may load; it is not a device launch.

  4. 04 · VALUEWhy anyone cares

    Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the model layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Defines model identity, architecture, tensor categories, or precision before an engine can load the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned checkpoint or configuration plus the workload's model requirements. Output boundary: A model contract that a compatible framework or engine may load; it is not a device launch.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-denoise-loop Pinned Wan2.2 denoising loop 6 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

Pinned Wan2.2 denoising loop

python

REGISTERED SOURCE · 6 DISPLAYED LINES

Source path not registered

     E01  for _, t in enumerate(timesteps):
     E02      model = self._prepare_model_for_timestep(t, boundary, offload_model)
     E03      noise_pred_cond = model(latent_model_input, t=timestep, **arg_c)[0]
     E04      noise_pred_uncond = model(latent_model_input, t=timestep, **arg_null)[0]
     E05      noise_pred = noise_pred_uncond + scale * (noise_pred_cond - noise_pred_uncond)
     E06      latents = sample_scheduler.step(noise_pred.unsqueeze(0), t, latents).prev_sample

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 6 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 for _, t in enumerate(timesteps):

This loop advances the Wan2.2 denoiser once for each scheduler timestep.

Source
Python iterates over the scheduler's timestep sequence and binds the current value to t.
Runtime / compiler
Each iteration can re-enter the model, attention, communication, and latent-update paths.
GPU execution
The loop is host-level control; kernels and GPU execution units are chosen inside the called model operations.
Memory path
Weights and latent tensors may be reused or reread each iteration, but exact iterations, residency, transfers, and HBM bytes require the run.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 model = self._prepare_model_for_timestep(t, boundary, offload_model)

This line calls `self._prepare_model_for_timestep(...)` and binds its returned value to `model` for later use in Pinned Wan2.2 denoising loop. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `model ← self._prepare_model_for_timestep(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 noise_pred_cond = model(latent_model_input, t=timestep, **arg_c)[0]

This line calls `model(...)` and binds its returned value to `noise_pred_cond` for later use in Pinned Wan2.2 denoising loop. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `noise_pred_cond ← model(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 noise_pred_uncond = model(latent_model_input, t=timestep, **arg_null)[0]

This line calls `model(...)` and binds its returned value to `noise_pred_uncond` for later use in Pinned Wan2.2 denoising loop. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `noise_pred_uncond ← model(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 noise_pred = noise_pred_uncond + scale * (noise_pred_cond - noise_pred_uncond)

This line binds or updates `noise_pred = noise_pred_uncond + scale * (noise_pred_cond - noise_pred_uncond)` for later source in Pinned Wan2.2 denoising loop. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `noise_pred = noise_pred_uncond + scale * (noise_pred_cond - noise_pred_uncond)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 latents = sample_scheduler.step(noise_pred.unsqueeze(0), t, latents).prev_sample

This line calls `sample_scheduler.step(...)` and binds its returned value to `latents` for later use in Pinned Wan2.2 denoising loop. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `latents ← sample_scheduler.step(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 6 Read this exact line
for _, t in enumerate(timesteps):
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This loop advances the Wan2.2 denoiser once for each scheduler timestep.

What changes next in software

Each iteration can re-enter the model, attention, communication, and latent-update paths.

What it means on the GPU

The loop is host-level control; kernels and GPU execution units are chosen inside the called model operations.

How bytes could move

Weights and latent tensors may be reused or reread each iteration, but exact iterations, residency, transfers, and HBM bytes require the run.

Why this line could matter to useful work

This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 engine python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: text-encodelatent-initexpert-selectqkv-attentionconditional-passesguidancescheduler-steprepeat-denoisevae-decode

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is Pinned Wan2.2 denoising loop.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-attention Pinned transient Q/K/V attention path 14 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

Pinned transient Q/K/V attention path

python

REGISTERED SOURCE · 14 DISPLAYED LINES

Source path not registered

     E01  def qkv_fn(x):
     E02      q = self.norm_q(self.q(x)).view(b, s, n, d)
     E03      k = self.norm_k(self.k(x)).view(b, s, n, d)
     E04      v = self.v(x).view(b, s, n, d)
     E05      return q, k, v
     E06
     E07  q, k, v = qkv_fn(x)
     E08
     E09  x = flash_attention(
     E10      q=rope_apply(q, grid_sizes, freqs),
     E11      k=rope_apply(k, grid_sizes, freqs),
     E12      v=v,
     E13      k_lens=seq_lens,
     E14      window_size=self.window_size)

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 14 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 def qkv_fn(x):

This line begins the `qkv_fn` callable contract used by Pinned transient Q/K/V attention path; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `qkv_fn` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 q = self.norm_q(self.q(x)).view(b, s, n, d)

This line calls `self.norm_q(...)` and binds its returned value to `q` for later use in Pinned transient Q/K/V attention path. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `q ← self.norm_q(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 k = self.norm_k(self.k(x)).view(b, s, n, d)

This line calls `self.norm_k(...)` and binds its returned value to `k` for later use in Pinned transient Q/K/V attention path. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `k ← self.norm_k(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 v = self.v(x).view(b, s, n, d)

This line calls `self.v(...)` and binds its returned value to `v` for later use in Pinned transient Q/K/V attention path. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `v ← self.v(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 return q, k, v

This line returns `return q, k, v` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return q, k, v` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 q, k, v = qkv_fn(x)

This line calls `qkv_fn(...)` and binds its returned value to `v` for later use in Pinned transient Q/K/V attention path. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `v ← qkv_fn(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 x = flash_attention(

This line calls `flash_attention(...)` and binds its returned value to `x` for later use in Pinned transient Q/K/V attention path. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `x ← flash_attention(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 q=rope_apply(q, grid_sizes, freqs),

This line calls `rope_apply(...)` and binds its returned value to `q` for later use in Pinned transient Q/K/V attention path. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `q ← rope_apply(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 k=rope_apply(k, grid_sizes, freqs),

This line calls `rope_apply(...)` and binds its returned value to `k` for later use in Pinned transient Q/K/V attention path. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `k ← rope_apply(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 v=v,

This line binds or updates `v = v,` for later source in Pinned transient Q/K/V attention path. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `v = v,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 k_lens=seq_lens,

This line binds or updates `k_lens = seq_lens,` for later source in Pinned transient Q/K/V attention path. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `k_lens = seq_lens,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 window_size=self.window_size)

This line binds or updates `window_size = self.window_size)` for later source in Pinned transient Q/K/V attention path. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `window_size = self.window_size)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 14 Read this exact line
def qkv_fn(x):
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `qkv_fn` callable contract used by Pinned transient Q/K/V attention path; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 operator python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: qkv-attentionulysses-fsdpconditional-passesrepeat-denoise

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is Pinned transient Q/K/V attention path.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    These Q/K/V tensors are transient diffusion intermediates, not autoregressive KV cache.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-distributed-launch Official FSDP plus Ulysses launch surface 3 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Official FSDP plus Ulysses launch surface

bash

REGISTERED SOURCE · 3 DISPLAYED LINES

Source path not registered

     E01  torchrun --nproc_per_node=8 generate.py \
     E02    --task t2v-A14B --dit_fsdp --t5_fsdp \
     E03    --ulysses_size 8 --ckpt_dir ./Wan2.2-T2V-A14B

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 3 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 torchrun --nproc_per_node=8 generate.py \

This line invokes `torchrun` in the Official FSDP plus Ulysses launch surface source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `torchrun` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 --task t2v-A14B --dit_fsdp --t5_fsdp \

This continuation line declares or passes `--task t2v-A14B --dit_fsdp --t5_fsdp` as part of the surrounding call or signature in Official FSDP plus Ulysses launch surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `--task t2v-A14B --dit_fsdp --t5_fsdp` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 --ulysses_size 8 --ckpt_dir ./Wan2.2-T2V-A14B

This continuation line declares or passes `--ulysses_size 8 --ckpt_dir ./Wan2.2-T2V-A14B` as part of the surrounding call or signature in Official FSDP plus Ulysses launch surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `--ulysses_size 8 --ckpt_dir ./Wan2.2-T2V-A14B` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 3 Read this exact line
torchrun --nproc_per_node=8 generate.py \
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `torchrun` in the Official FSDP plus Ulysses launch surface source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is Official FSDP plus Ulysses launch surface.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Launch documentation and the source wiring above prove the FSDP/Ulysses code path exists and is reachable from CLI flags. Neither is a captured collective trace, dispatch record, or performance receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-shared-config-dtype Shared config: BF16 default dtypes and 81-frame default 6 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

Shared config: BF16 default dtypes and 81-frame default

python

REGISTERED SOURCE · 6 DISPLAYED LINES

Source path not registered

     E01  wan_shared_cfg.t5_dtype = torch.bfloat16
     E02  wan_shared_cfg.text_len = 512
     E03  wan_shared_cfg.param_dtype = torch.bfloat16
     E04  wan_shared_cfg.num_train_timesteps = 1000
     E05  wan_shared_cfg.sample_fps = 16
     E06  wan_shared_cfg.frame_num = 81

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 6 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 wan_shared_cfg.t5_dtype = torch.bfloat16

This line binds or updates `wan_shared_cfg.t5_dtype = torch.bfloat16` for later source in Shared config: BF16 default dtypes and 81-frame default. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `wan_shared_cfg.t5_dtype = torch.bfloat16` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 wan_shared_cfg.text_len = 512

This line binds or updates `wan_shared_cfg.text_len = 512` for later source in Shared config: BF16 default dtypes and 81-frame default. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `wan_shared_cfg.text_len = 512` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 wan_shared_cfg.param_dtype = torch.bfloat16

This line binds or updates `wan_shared_cfg.param_dtype = torch.bfloat16` for later source in Shared config: BF16 default dtypes and 81-frame default. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `wan_shared_cfg.param_dtype = torch.bfloat16` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 wan_shared_cfg.num_train_timesteps = 1000

This line binds or updates `wan_shared_cfg.num_train_timesteps = 1000` for later source in Shared config: BF16 default dtypes and 81-frame default. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `wan_shared_cfg.num_train_timesteps = 1000` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 wan_shared_cfg.sample_fps = 16

This line binds or updates `wan_shared_cfg.sample_fps = 16` for later source in Shared config: BF16 default dtypes and 81-frame default. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `wan_shared_cfg.sample_fps = 16` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 wan_shared_cfg.frame_num = 81

This line binds or updates `wan_shared_cfg.frame_num = 81` for later source in Shared config: BF16 default dtypes and 81-frame default. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `wan_shared_cfg.frame_num = 81` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 6 Read this exact line
wan_shared_cfg.t5_dtype = torch.bfloat16
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line binds or updates `wan_shared_cfg.t5_dtype = torch.bfloat16` for later source in Shared config: BF16 default dtypes and 81-frame default. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.

What it means on the GPU

This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.

How bytes could move

It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.

Why this line could matter to useful work

This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 model python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: latent-init

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is Shared config: BF16 default dtypes and 81-frame default.
  1. 01 · BEFOREWhat enters

    A pinned checkpoint or configuration plus the workload's model requirements.

  2. 02 · THIS SOURCEWhat role it owns

    Defines model identity, architecture, tensor categories, or precision before an engine can load the workload.

  3. 03 · AFTERWhat leaves

    A model contract that a compatible framework or engine may load; it is not a device launch.

  4. 04 · VALUEWhy anyone cares

    Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the model layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Defines model identity, architecture, tensor categories, or precision before an engine can load the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned checkpoint or configuration plus the workload's model requirements. Output boundary: A model contract that a compatible framework or engine may load; it is not a device launch.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-t5-text-encoder T5EncoderModel (UMT5-XXL) prompt encoding 10 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

T5EncoderModel (UMT5-XXL) prompt encoding

python

REGISTERED SOURCE · 10 DISPLAYED LINES

Source path not registered

     E01  class T5EncoderModel:
     E02      def __init__(self, text_len, dtype=torch.bfloat16,
     E03                   device=torch.cuda.current_device(),
     E04                   checkpoint_path=None, tokenizer_path=None, shard_fn=None):
     E05          ...
     E06      def __call__(self, texts, device):
     E07          ids, mask = self.tokenizer(texts, return_mask=True, add_special_tokens=True)
     E08          seq_lens = mask.gt(0).sum(dim=1).long()
     E09          context = self.model(ids, mask)
     E10          return [u[:v] for u, v in zip(context, seq_lens)]

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 10 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 class T5EncoderModel:

This line begins the `T5EncoderModel` type used by T5EncoderModel (UMT5-XXL) prompt encoding; its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `T5EncoderModel` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 def __init__(self, text_len, dtype=torch.bfloat16,

This line begins the `__init__` callable contract used by T5EncoderModel (UMT5-XXL) prompt encoding; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `__init__` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 device=torch.cuda.current_device(),

This line calls `torch.cuda.current_device(...)` and binds its returned value to `device` for later use in T5EncoderModel (UMT5-XXL) prompt encoding. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `device ← torch.cuda.current_device(...)` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 checkpoint_path=None, tokenizer_path=None, shard_fn=None):

This line binds or updates `checkpoint_path = None, tokenizer_path=None, shard_fn=None):` for later source in T5EncoderModel (UMT5-XXL) prompt encoding. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `checkpoint_path = None, tokenizer_path=None, shard_fn=None):` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 def __call__(self, texts, device):

This line begins the `__call__` callable contract used by T5EncoderModel (UMT5-XXL) prompt encoding; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `__call__` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 ids, mask = self.tokenizer(texts, return_mask=True, add_special_tokens=True)

This line calls `self.tokenizer(...)` and binds its returned value to `mask` for later use in T5EncoderModel (UMT5-XXL) prompt encoding. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `mask ← self.tokenizer(...)` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 seq_lens = mask.gt(0).sum(dim=1).long()

This line calls `mask.gt(...)` and binds its returned value to `seq_lens` for later use in T5EncoderModel (UMT5-XXL) prompt encoding. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `seq_lens ← mask.gt(...)` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 context = self.model(ids, mask)

This line calls `self.model(...)` and binds its returned value to `context` for later use in T5EncoderModel (UMT5-XXL) prompt encoding. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `context ← self.model(...)` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 return [u[:v] for u, v in zip(context, seq_lens)]

This line returns `return [u[:v] for u, v in zip(context, seq_lens)]` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `return [u[:v] for u, v in zip(context, seq_lens)]` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 10 Read this exact line
class T5EncoderModel:
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `T5EncoderModel` type used by T5EncoderModel (UMT5-XXL) prompt encoding; its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.

What it means on the GPU

This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.

How bytes could move

It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.

Why this line could matter to useful work

If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 model python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: text-encode

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is T5EncoderModel (UMT5-XXL) prompt encoding.
  1. 01 · BEFOREWhat enters

    A pinned checkpoint or configuration plus the workload's model requirements.

  2. 02 · THIS SOURCEWhat role it owns

    Defines model identity, architecture, tensor categories, or precision before an engine can load the workload.

  3. 03 · AFTERWhat leaves

    A model contract that a compatible framework or engine may load; it is not a device launch.

  4. 04 · VALUEWhy anyone cares

    Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the model layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Defines model identity, architecture, tensor categories, or precision before an engine can load the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned checkpoint or configuration plus the workload's model requirements. Output boundary: A model contract that a compatible framework or engine may load; it is not a device launch.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-vae2-1-decode Wan2_1_VAE.decode -- the exact pinned VAE (not a newer Wan2.2 VAE) 8 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

Wan2_1_VAE.decode -- the exact pinned VAE (not a newer Wan2.2 VAE)

python

REGISTERED SOURCE · 8 DISPLAYED LINES

Source path not registered

     E01  class Wan2_1_VAE:
     E02      def __init__(self, z_dim=16, vae_pth='cache/vae_step_411000.pth',
     E03                   dtype=torch.float, device='cuda'):
     E04          ...
     E05      def decode(self, zs):
     E06          with amp.autocast(dtype=self.dtype):
     E07              return [self.model.decode(u.unsqueeze(0), self.scale)
     E08                          .float().clamp_(-1, 1).squeeze(0) for u in zs]

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 8 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 class Wan2_1_VAE:

This line begins the `Wan2_1_VAE` type used by Wan2_1_VAE.decode -- the exact pinned VAE (not a newer Wan2.2 VAE); its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `Wan2_1_VAE` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 def __init__(self, z_dim=16, vae_pth='cache/vae_step_411000.pth',

This line begins the `__init__` callable contract used by Wan2_1_VAE.decode -- the exact pinned VAE (not a newer Wan2.2 VAE); the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `__init__` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 dtype=torch.float, device='cuda'):

This line binds or updates `dtype = torch.float, device='cuda'):` for later source in Wan2_1_VAE.decode -- the exact pinned VAE (not a newer Wan2.2 VAE). The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `dtype = torch.float, device='cuda'):` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 def decode(self, zs):

This line begins the `decode` callable contract used by Wan2_1_VAE.decode -- the exact pinned VAE (not a newer Wan2.2 VAE); the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `decode` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 with amp.autocast(dtype=self.dtype):

This line invokes the call chain `amp.autocast` when Wan2_1_VAE.decode -- the exact pinned VAE (not a newer Wan2.2 VAE) executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `amp.autocast` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 return [self.model.decode(u.unsqueeze(0), self.scale)

This line returns `return [self.model.decode(u.unsqueeze(0), self.scale)` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `return [self.model.decode(u.unsqueeze(0), self.scale)` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 .float().clamp_(-1, 1).squeeze(0) for u in zs]

This line invokes the call chain `float → clamp_ → squeeze` when Wan2_1_VAE.decode -- the exact pinned VAE (not a newer Wan2.2 VAE) executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `float → clamp_ → squeeze` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 8 Read this exact line
class Wan2_1_VAE:
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `Wan2_1_VAE` type used by Wan2_1_VAE.decode -- the exact pinned VAE (not a newer Wan2.2 VAE); its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.

What it means on the GPU

This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.

How bytes could move

It can change potential parameter/activation capacity and placement, but allocation, residency, cache behavior, and HBM bytes need a run.

Why this line could matter to useful work

If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 model python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: vae-decode

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is Wan2_1_VAE.decode -- the exact pinned VAE (not a newer Wan2.2 VAE).
  1. 01 · BEFOREWhat enters

    A pinned checkpoint or configuration plus the workload's model requirements.

  2. 02 · THIS SOURCEWhat role it owns

    Defines model identity, architecture, tensor categories, or precision before an engine can load the workload.

  3. 03 · AFTERWhat leaves

    A model contract that a compatible framework or engine may load; it is not a device launch.

  4. 04 · VALUEWhy anyone cares

    Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the model layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Defines model identity, architecture, tensor categories, or precision before an engine can load the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned checkpoint or configuration plus the workload's model requirements. Output boundary: A model contract that a compatible framework or engine may load; it is not a device launch.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-fsdp-shard shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set) 15 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set)

python

REGISTERED SOURCE · 15 DISPLAYED LINES

Source path not registered

     E01  def shard_model(model, device_id, param_dtype=torch.bfloat16,
     E02                   reduce_dtype=torch.float32, buffer_dtype=torch.float32,
     E03                   process_group=None,
     E04                   sharding_strategy=ShardingStrategy.FULL_SHARD,
     E05                   sync_module_states=True, use_lora=False):
     E06      model = FSDP(module=model, process_group=process_group,
     E07                    sharding_strategy=sharding_strategy,
     E08                    auto_wrap_policy=partial(lambda_auto_wrap_policy,
     E09                        lambda_fn=lambda m: m in model.blocks),
     E10                    mixed_precision=MixedPrecision(param_dtype=param_dtype,
     E11                        reduce_dtype=reduce_dtype, buffer_dtype=buffer_dtype),
     E12                    device_id=device_id,
     E13                    sync_module_states=sync_module_states,
     E14                    use_orig_params=True if use_lora else False)
     E15      return model

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 15 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 def shard_model(model, device_id, param_dtype=torch.bfloat16,

This line begins the `shard_model` callable contract used by shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set); the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `shard_model` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 reduce_dtype=torch.float32, buffer_dtype=torch.float32,

This line binds or updates `reduce_dtype = torch.float32, buffer_dtype=torch.float32,` for later source in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `reduce_dtype = torch.float32, buffer_dtype=torch.float32,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 process_group=None,

This line binds or updates `process_group = None,` for later source in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `process_group = None,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 sharding_strategy=ShardingStrategy.FULL_SHARD,

This line binds or updates `sharding_strategy = ShardingStrategy.FULL_SHARD,` for later source in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `sharding_strategy = ShardingStrategy.FULL_SHARD,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 sync_module_states=True, use_lora=False):

This line binds or updates `sync_module_states = True, use_lora=False):` for later source in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `sync_module_states = True, use_lora=False):` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 model = FSDP(module=model, process_group=process_group,

This line calls `FSDP(...)` and binds its returned value to `model` for later use in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `model ← FSDP(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 sharding_strategy=sharding_strategy,

This line binds or updates `sharding_strategy = sharding_strategy,` for later source in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `sharding_strategy = sharding_strategy,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 auto_wrap_policy=partial(lambda_auto_wrap_policy,

This line calls `partial(...)` and binds its returned value to `auto_wrap_policy` for later use in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `auto_wrap_policy ← partial(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 lambda_fn=lambda m: m in model.blocks),

This line binds or updates `lambda_fn = lambda m: m in model.blocks),` for later source in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `lambda_fn = lambda m: m in model.blocks),` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 mixed_precision=MixedPrecision(param_dtype=param_dtype,

This line calls `MixedPrecision(...)` and binds its returned value to `mixed_precision` for later use in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `mixed_precision ← MixedPrecision(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 reduce_dtype=reduce_dtype, buffer_dtype=buffer_dtype),

This line binds or updates `reduce_dtype = reduce_dtype, buffer_dtype=buffer_dtype),` for later source in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `reduce_dtype = reduce_dtype, buffer_dtype=buffer_dtype),` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 device_id=device_id,

This line binds or updates `device_id = device_id,` for later source in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `device_id = device_id,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 sync_module_states=sync_module_states,

This line binds or updates `sync_module_states = sync_module_states,` for later source in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `sync_module_states = sync_module_states,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 use_orig_params=True if use_lora else False)

This line binds or updates `use_orig_params = True if use_lora else False)` for later source in shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set). The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `use_orig_params = True if use_lora else False)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 return model

This line returns `return model` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `return model` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 15 Read this exact line
def shard_model(model, device_id, param_dtype=torch.bfloat16,
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `shard_model` callable contract used by shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set); the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.

Why this line could matter to useful work

This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 kernel python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is shard_model -- FSDP FULL_SHARD wrap (only reachable when dit_fsdp/t5_fsdp is set).
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-ulysses-all-to-all Ulysses sequence-parallel attention -- plain torch.distributed all_to_all, no DeepSpeed runtime 10 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

Ulysses sequence-parallel attention -- plain torch.distributed all_to_all, no DeepSpeed runtime

python

REGISTERED SOURCE · 10 DISPLAYED LINES

Source path not registered

     E01  def distributed_attention(q, k, v, seq_lens, window_size=(-1, -1)):
     E02      """...please refer to https://arxiv.org/pdf/2309.14509"""
     E03      if not dist.is_initialized():
     E04          raise ValueError('distributed group should be initialized.')
     E05      q = all_to_all(q, scatter_dim=2, gather_dim=1)
     E06      k = all_to_all(k, scatter_dim=2, gather_dim=1)
     E07      v = all_to_all(v, scatter_dim=2, gather_dim=1)
     E08      x = flash_attention(q, k, v, k_lens=seq_lens, window_size=window_size)
     E09      x = all_to_all(x, scatter_dim=1, gather_dim=2)
     E10      return x

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 10 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 def distributed_attention(q, k, v, seq_lens, window_size=(-1, -1)):

This line begins the `distributed_attention` callable contract used by Ulysses sequence-parallel attention -- plain torch.distributed all_to_all, no DeepSpeed runtime; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `distributed_attention` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """...please refer to https://arxiv.org/pdf/2309.14509"""

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 if not dist.is_initialized():

This line selects a control path using `if not dist.is_initialized():` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if not dist.is_initialized():` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 raise ValueError('distributed group should be initialized.')

This line enforces `raise ValueError('distributed group should be initialized.')` and stops or rejects the path when the condition fails. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `raise ValueError('distributed group should be initialized.')` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 q = all_to_all(q, scatter_dim=2, gather_dim=1)

This line calls `all_to_all(...)` and binds its returned value to `q` for later use in Ulysses sequence-parallel attention -- plain torch.distributed all_to_all, no DeepSpeed runtime. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `q ← all_to_all(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 k = all_to_all(k, scatter_dim=2, gather_dim=1)

This line calls `all_to_all(...)` and binds its returned value to `k` for later use in Ulysses sequence-parallel attention -- plain torch.distributed all_to_all, no DeepSpeed runtime. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `k ← all_to_all(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 v = all_to_all(v, scatter_dim=2, gather_dim=1)

This line calls `all_to_all(...)` and binds its returned value to `v` for later use in Ulysses sequence-parallel attention -- plain torch.distributed all_to_all, no DeepSpeed runtime. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `v ← all_to_all(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 x = flash_attention(q, k, v, k_lens=seq_lens, window_size=window_size)

This line calls `flash_attention(...)` and binds its returned value to `x` for later use in Ulysses sequence-parallel attention -- plain torch.distributed all_to_all, no DeepSpeed runtime. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `x ← flash_attention(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 x = all_to_all(x, scatter_dim=1, gather_dim=2)

This line calls `all_to_all(...)` and binds its returned value to `x` for later use in Ulysses sequence-parallel attention -- plain torch.distributed all_to_all, no DeepSpeed runtime. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `x ← all_to_all(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 return x

This line returns `return x` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `return x` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 10 Read this exact line
def distributed_attention(q, k, v, seq_lens, window_size=(-1, -1)):
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `distributed_attention` callable contract used by Ulysses sequence-parallel attention -- plain torch.distributed all_to_all, no DeepSpeed runtime; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.

Why this line could matter to useful work

This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 kernel python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: ulysses-fsdp

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is Ulysses sequence-parallel attention -- plain torch.distributed all_to_all, no DeepSpeed runtime.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-sp-wiring Sequence-parallel activation -- CLI flag to monkeypatched forward 5 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

Sequence-parallel activation -- CLI flag to monkeypatched forward

python

REGISTERED SOURCE · 5 DISPLAYED LINES

Source path not registered

     E01  if use_sp:
     E02      for block in model.blocks:
     E03          block.self_attn.forward = types.MethodType(
     E04              sp_attn_forward, block.self_attn)
     E05      model.forward = types.MethodType(sp_dit_forward, model)

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 5 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 if use_sp:

This line selects a control path using `if use_sp:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if use_sp:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 for block in model.blocks:

This line begins the repeated control path `for block in model.blocks:` inside Sequence-parallel activation -- CLI flag to monkeypatched forward. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `for block in model.blocks:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 block.self_attn.forward = types.MethodType(

This line calls `types.MethodType(...)` and binds its returned value to `block.self_attn.forward` for later use in Sequence-parallel activation -- CLI flag to monkeypatched forward. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `block.self_attn.forward ← types.MethodType(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 sp_attn_forward, block.self_attn)

This exact expression `sp_attn_forward, block.self_attn)` contributes to the surrounding Sequence-parallel activation -- CLI flag to monkeypatched forward statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `sp_attn_forward, block.self_attn)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 model.forward = types.MethodType(sp_dit_forward, model)

This line calls `types.MethodType(...)` and binds its returned value to `model.forward` for later use in Sequence-parallel activation -- CLI flag to monkeypatched forward. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `model.forward ← types.MethodType(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 5 Read this exact line
if use_sp:
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line selects a control path using `if use_sp:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 engine python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: ulysses-fsdp

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is Sequence-parallel activation -- CLI flag to monkeypatched forward.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-cli-entry-generate generate.py CLI entry point -- argparse to WanT2V construction 12 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

generate.py CLI entry point -- argparse to WanT2V construction

python

REGISTERED SOURCE · 12 DISPLAYED LINES

Source path not registered

     E01  parser.add_argument('--task', ...)
     E02  parser.add_argument('--frame_num', ...)
     E03  parser.add_argument('--ckpt_dir', ...)
     E04  parser.add_argument('--ulysses_size', ...)
     E05  parser.add_argument('--t5_fsdp', action='store_true', ...)
     E06  parser.add_argument('--dit_fsdp', action='store_true', ...)
     E07  ...
     E08  wan_t2v = wan.WanT2V(
     E09      config=cfg, checkpoint_dir=args.ckpt_dir,
     E10      t5_fsdp=args.t5_fsdp, dit_fsdp=args.dit_fsdp,
     E11      use_sp=(args.ulysses_size > 1), ...)
     E12  video = wan_t2v.generate(args.prompt, frame_num=args.frame_num, ...)

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 12 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 parser.add_argument('--task', ...)

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 parser.add_argument('--frame_num', ...)

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 parser.add_argument('--ckpt_dir', ...)

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 parser.add_argument('--ulysses_size', ...)

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 parser.add_argument('--t5_fsdp', action='store_true', ...)

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 parser.add_argument('--dit_fsdp', action='store_true', ...)

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 wan_t2v = wan.WanT2V(

This line calls `wan.WanT2V(...)` and binds its returned value to `wan_t2v` for later use in generate.py CLI entry point -- argparse to WanT2V construction. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `wan_t2v ← wan.WanT2V(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 config=cfg, checkpoint_dir=args.ckpt_dir,

This line binds or updates `config = cfg, checkpoint_dir=args.ckpt_dir,` for later source in generate.py CLI entry point -- argparse to WanT2V construction. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `config = cfg, checkpoint_dir=args.ckpt_dir,` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 t5_fsdp=args.t5_fsdp, dit_fsdp=args.dit_fsdp,

This line binds or updates `t5_fsdp = args.t5_fsdp, dit_fsdp=args.dit_fsdp,` for later source in generate.py CLI entry point -- argparse to WanT2V construction. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `t5_fsdp = args.t5_fsdp, dit_fsdp=args.dit_fsdp,` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 use_sp=(args.ulysses_size > 1), ...)

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 video = wan_t2v.generate(args.prompt, frame_num=args.frame_num, ...)

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 12 Read this exact line
parser.add_argument('--task', ...)
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 engine python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is generate.py CLI entry point -- argparse to WanT2V construction.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-fp8-not-in-reference FP8 is attributed to a third-party project, not the pinned reference repo 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

FP8 is attributed to a third-party project, not the pinned reference repo

markdown

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  [DiffSynth-Studio](https://github.com/modelscope/DiffSynth-Studio) provides comprehensive support for Wan 2.2, including low-GPU-memory layer-by-layer offload, FP8 quantization, sequence parallelism, LoRA training, full training.

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Copy engine or SM-issued movementPOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 [DiffSynth-Studio](https://github.com/modelscope/DiffSynth-Studio) provides comprehensive support for Wan 2.2, including low-GPU-memory layer-by-layer offload, FP8 quantization, sequence parallelism, LoRA training, full training.

This README statement records that the pinned Wan2.2 reference does not declare FP8 for this path; it is not power or cost code.

Source
The line documents an absence in the reference implementation.
Runtime / compiler
It does not configure dtype, launch a workload, profile the GPU, or collect telemetry.
GPU execution
No GPU execution unit is selected.
Memory path
No HBM capacity, bandwidth, power, energy, water, or cost value follows from this documentation line.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
[DiffSynth-Studio](https://github.com/modelscope/DiffSynth-Studio) provides comprehensive support for Wan 2.2, including low-GPU-memory layer-by-layer offload, FP8 quantization, sequence parallelism, LoRA training, full training.
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKCopy engine or SM-issued movement
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This README statement records that the pinned Wan2.2 reference does not declare FP8 for this path; it is not power or cost code.

What changes next in software

It does not configure dtype, launch a workload, profile the GPU, or collect telemetry.

What it means on the GPU

No GPU execution unit is selected.

How bytes could move

No HBM capacity, bandwidth, power, energy, water, or cost value follows from this documentation line.

Why this line could matter to useful work

This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 power-cost markdown coverage: not_applicable observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This markdown excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is FP8 is attributed to a third-party project, not the pinned reference repo.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=not_applicable and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

diffusers-wan-pipeline Diffusers WanPipeline -- alternative implementation, NOT the selected trace 6 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Diffusers WanPipeline -- alternative implementation, NOT the selected trace

python

REGISTERED SOURCE · 6 DISPLAYED LINES

Source path not registered

     E01  class WanPipeline(...):
     E02      model_cpu_offload_seq = 'text_encoder->transformer->transformer_2->vae'
     E03      def __init__(self, ..., transformer_2=None, boundary_ratio=None, ...):
     E04          ...
     E05      def __call__(self, ..., num_frames: int = 81, ...):
     E06          ...

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 6 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 class WanPipeline(...):

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 model_cpu_offload_seq = 'text_encoder->transformer->transformer_2->vae'

This line binds or updates `model_cpu_offload_seq = 'text_encoder->transformer->transformer_2->vae'` for later source in Diffusers WanPipeline -- alternative implementation, NOT the selected trace. The excerpt line is exact, but the upstream file line number is not registered.

Source
The model/configuration layer consumes `model_cpu_offload_seq = 'text_encoder->transformer->transformer_2->vae'` while defining architecture, tensor metadata, or loader behavior.
Runtime / compiler
A loader or engine may use this declaration to create modules, parameter groups, shapes, or dtypes before dispatch.
GPU execution
This source line does not select an operator backend, kernel, SM/CU, warp/wavefront, or tensor core.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 def __init__(self, ..., transformer_2=None, boundary_ratio=None, ...):

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 def __call__(self, ..., num_frames: int = 81, ...):

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 6 Read this exact line
class WanPipeline(...):
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

If this field changes model shape, tensor precision, or compatibility, it can change memory capacity, hardware eligibility, and quality risk. Those consequences require a loaded model and accepted-work replay.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · huggingface

Source path: not supplied

Revision: 01969142b55379991fee07608c9e7e8f80afced0

V-001 model python coverage: not_applicable observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is Diffusers WanPipeline -- alternative implementation, NOT the selected trace.
  1. 01 · BEFOREWhat enters

    A pinned checkpoint or configuration plus the workload's model requirements.

  2. 02 · THIS SOURCEWhat role it owns

    Defines model identity, architecture, tensor categories, or precision before an engine can load the workload.

  3. 03 · AFTERWhat leaves

    A model contract that a compatible framework or engine may load; it is not a device launch.

  4. 04 · VALUEWhy anyone cares

    Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the model layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Model shape and precision influence memory capacity, compatible hardware, serving options, and quality risk. They do not by themselves prove lower cost or higher throughput.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Defines model identity, architecture, tensor categories, or precision before an engine can load the workload. The current record is coverage=not_applicable and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned checkpoint or configuration plus the workload's model requirements. Output boundary: A model contract that a compatible framework or engine may load; it is not a device launch.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-attention-dispatch flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert 23 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert

python

REGISTERED SOURCE · 23 DISPLAYED LINES

Source path not registered

     E01  try:
     E02      import flash_attn_interface
     E03      FLASH_ATTN_3_AVAILABLE = True
     E04  except ModuleNotFoundError:
     E05      FLASH_ATTN_3_AVAILABLE = False
     E06  try:
     E07      import flash_attn
     E08      FLASH_ATTN_2_AVAILABLE = True
     E09  except ModuleNotFoundError:
     E10      FLASH_ATTN_2_AVAILABLE = False
     E11  ...
     E12  if (version is None or version == 3) and FLASH_ATTN_3_AVAILABLE:
     E13      x = flash_attn_interface.flash_attn_varlen_func(
     E14          q=q, k=k, v=v, ...)[0].unflatten(0, (b, lq))
     E15  else:
     E16      assert FLASH_ATTN_2_AVAILABLE
     E17      x = flash_attn.flash_attn_varlen_func(
     E18          q=q, k=k, v=v,
     E19          cu_seqlens_q=..., cu_seqlens_k=...,
     E20          max_seqlen_q=lq, max_seqlen_k=lk,
     E21          dropout_p=dropout_p, softmax_scale=softmax_scale,
     E22          causal=causal, window_size=window_size,
     E23          deterministic=deterministic).unflatten(0, (b, lq))

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 23 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 try:

This continuation line declares or passes `try:` as part of the surrounding call or signature in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `try:` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 import flash_attn_interface

This line imports `import flash_attn_interface` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import flash_attn_interface` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 FLASH_ATTN_3_AVAILABLE = True

This line binds or updates `FLASH_ATTN_3_AVAILABLE = True` for later source in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `FLASH_ATTN_3_AVAILABLE = True` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 except ModuleNotFoundError:

This exact expression `except ModuleNotFoundError:` contributes to the surrounding flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `except ModuleNotFoundError:` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 FLASH_ATTN_3_AVAILABLE = False

This line binds or updates `FLASH_ATTN_3_AVAILABLE = False` for later source in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `FLASH_ATTN_3_AVAILABLE = False` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 try:

This continuation line declares or passes `try:` as part of the surrounding call or signature in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `try:` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 import flash_attn

This line imports `import flash_attn` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import flash_attn` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 FLASH_ATTN_2_AVAILABLE = True

This line binds or updates `FLASH_ATTN_2_AVAILABLE = True` for later source in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `FLASH_ATTN_2_AVAILABLE = True` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 except ModuleNotFoundError:

This exact expression `except ModuleNotFoundError:` contributes to the surrounding flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `except ModuleNotFoundError:` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 FLASH_ATTN_2_AVAILABLE = False

This line binds or updates `FLASH_ATTN_2_AVAILABLE = False` for later source in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `FLASH_ATTN_2_AVAILABLE = False` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 if (version is None or version == 3) and FLASH_ATTN_3_AVAILABLE:

This line selects a control path using `if (version is None or version == 3) and FLASH_ATTN_3_AVAILABLE:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if (version is None or version == 3) and FLASH_ATTN_3_AVAILABLE:` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 x = flash_attn_interface.flash_attn_varlen_func(

This line calls `flash_attn_interface.flash_attn_varlen_func(...)` and binds its returned value to `x` for later use in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `x ← flash_attn_interface.flash_attn_varlen_func(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 q=q, k=k, v=v, ...)[0].unflatten(0, (b, lq))

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 else:

This line selects a control path using `else:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `else:` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 assert FLASH_ATTN_2_AVAILABLE

This line enforces `assert FLASH_ATTN_2_AVAILABLE` and stops or rejects the path when the condition fails. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `assert FLASH_ATTN_2_AVAILABLE` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 x = flash_attn.flash_attn_varlen_func(

This line calls `flash_attn.flash_attn_varlen_func(...)` and binds its returned value to `x` for later use in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `x ← flash_attn.flash_attn_varlen_func(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 q=q, k=k, v=v,

This line binds or updates `q = q, k=k, v=v,` for later source in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `q = q, k=k, v=v,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 cu_seqlens_q=..., cu_seqlens_k=...,

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 max_seqlen_q=lq, max_seqlen_k=lk,

This line binds or updates `max_seqlen_q = lq, max_seqlen_k=lk,` for later source in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `max_seqlen_q = lq, max_seqlen_k=lk,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 dropout_p=dropout_p, softmax_scale=softmax_scale,

This signature line declares `dropout_p` as the requested attention-dropout probability.

Source
The caller must supply the requested attention-dropout probability.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 causal=causal, window_size=window_size,

This line binds or updates `causal = causal, window_size=window_size,` for later source in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `causal = causal, window_size=window_size,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 deterministic=deterministic).unflatten(0, (b, lq))

This line calls `unflatten(...)` and binds its returned value to `deterministic` for later use in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `deterministic ← unflatten(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 23 Read this exact line
try:
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This continuation line declares or passes `try:` as part of the surrounding call or signature in flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 kernel python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: qkv-attentionconditional-passesrepeat-denoise

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is flash_attention dispatch wrapper: FA3/FA2 probe, selection, and hard assert.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-sdpa-fallback attention() SDPA fallback: present in the file, never imported on the selected trace 9 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

attention() SDPA fallback: present in the file, never imported on the selected trace

python

REGISTERED SOURCE · 9 DISPLAYED LINES

Source path not registered

     E01  def attention(q, k, v, ..., fa_version=None):
     E02      if FLASH_ATTN_2_AVAILABLE or FLASH_ATTN_3_AVAILABLE:
     E03          return flash_attention(q=q, k=k, v=v, ...)
     E04      else:
     E05          if q_lens is not None or k_lens is not None:
     E06              warnings.warn('Padding mask is disabled when using scaled_dot_product_attention. ...')
     E07          out = torch.nn.functional.scaled_dot_product_attention(
     E08              q, k, v, attn_mask=attn_mask, is_causal=causal, dropout_p=dropout_p)
     E09          return out.transpose(1, 2).contiguous()

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 9 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 def attention(q, k, v, ..., fa_version=None):

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 if FLASH_ATTN_2_AVAILABLE or FLASH_ATTN_3_AVAILABLE:

This line selects a control path using `if FLASH_ATTN_2_AVAILABLE or FLASH_ATTN_3_AVAILABLE:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if FLASH_ATTN_2_AVAILABLE or FLASH_ATTN_3_AVAILABLE:` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 return flash_attention(q=q, k=k, v=v, ...)

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 else:

This line selects a control path using `else:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else:` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 if q_lens is not None or k_lens is not None:

This line selects a control path using `if q_lens is not None or k_lens is not None:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if q_lens is not None or k_lens is not None:` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 warnings.warn('Padding mask is disabled when using scaled_dot_product_attention. ...')

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 out = torch.nn.functional.scaled_dot_product_attention(

This line calls `torch.nn.functional.scaled_dot_product_attention(...)` and binds its returned value to `out` for later use in attention() SDPA fallback: present in the file, never imported on the selected trace. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `out ← torch.nn.functional.scaled_dot_product_attention(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 q, k, v, attn_mask=attn_mask, is_causal=causal, dropout_p=dropout_p)

This line binds or updates `attn_mask = attn_mask, is_causal=causal, dropout_p=dropout_p)` for later source in attention() SDPA fallback: present in the file, never imported on the selected trace. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `attn_mask = attn_mask, is_causal=causal, dropout_p=dropout_p)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 return out.transpose(1, 2).contiguous()

This line returns `return out.transpose(1, 2).contiguous()` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return out.transpose(1, 2).contiguous()` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 9 Read this exact line
def attention(q, k, v, ..., fa_version=None):
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 operator python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is attention() SDPA fallback: present in the file, never imported on the selected trace.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

flash-attn-varlen-func FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension 21 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension

python

REGISTERED SOURCE · 21 DISPLAYED LINES

Source path not registered

     E01  USE_TRITON_ROCM = os.getenv('FLASH_ATTENTION_TRITON_AMD_ENABLE', 'FALSE') == 'TRUE'
     E02  if USE_TRITON_ROCM:
     E03      from .flash_attn_triton_amd import interface_fa as flash_attn_gpu
     E04  else:
     E05      import flash_attn_2_cuda as flash_attn_gpu
     E06  ...
     E07  def _flash_attn_varlen_forward(q, k, v, cu_seqlens_q, cu_seqlens_k, ...):
     E08      out, softmax_lse, S_dmask, rng_state = flash_attn_gpu.varlen_fwd(
     E09          q, k, v, ...)
     E10  ...
     E11  def flash_attn_varlen_func(q, k, v, cu_seqlens_q, cu_seqlens_k,
     E12                             max_seqlen_q, max_seqlen_k, dropout_p=0.0,
     E13                             softmax_scale=None, causal=False,
     E14                             window_size=(-1, -1), softcap=0.0,
     E15                             alibi_slopes=None, deterministic=False,
     E16                             return_attn_probs=False, block_table=None):
     E17      return FlashAttnVarlenFunc.apply(
     E18          q, k, v, cu_seqlens_q, cu_seqlens_k, max_seqlen_q, max_seqlen_k,
     E19          dropout_p, softmax_scale, causal, window_size, softcap,
     E20          alibi_slopes, deterministic, return_attn_probs, block_table,
     E21          torch.is_grad_enabled())

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 21 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 USE_TRITON_ROCM = os.getenv('FLASH_ATTENTION_TRITON_AMD_ENABLE', 'FALSE') == 'TRUE'

This line calls `os.getenv(...)` and binds its returned value to `USE_TRITON_ROCM` for later use in FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `USE_TRITON_ROCM ← os.getenv(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 if USE_TRITON_ROCM:

This line selects a control path using `if USE_TRITON_ROCM:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if USE_TRITON_ROCM:` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 from .flash_attn_triton_amd import interface_fa as flash_attn_gpu

This line imports `from .flash_attn_triton_amd import interface_fa as flash_attn_gpu` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `from .flash_attn_triton_amd import interface_fa as flash_attn_gpu` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 else:

This line selects a control path using `else:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `else:` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 import flash_attn_2_cuda as flash_attn_gpu

This line imports `import flash_attn_2_cuda as flash_attn_gpu` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import flash_attn_2_cuda as flash_attn_gpu` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 def _flash_attn_varlen_forward(q, k, v, cu_seqlens_q, cu_seqlens_k, ...):

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 out, softmax_lse, S_dmask, rng_state = flash_attn_gpu.varlen_fwd(

This line calls `flash_attn_gpu.varlen_fwd(...)` and binds its returned value to `rng_state` for later use in FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `rng_state ← flash_attn_gpu.varlen_fwd(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 q, k, v, ...)

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 def flash_attn_varlen_func(q, k, v, cu_seqlens_q, cu_seqlens_k,

This line begins the `flash_attn_varlen_func` callable contract used by FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `flash_attn_varlen_func` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 max_seqlen_q, max_seqlen_k, dropout_p=0.0,

This signature line declares `dropout_p` as the requested attention-dropout probability.

Source
The caller must supply the requested attention-dropout probability.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 softmax_scale=None, causal=False,

This line binds or updates `softmax_scale = None, causal=False,` for later source in FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `softmax_scale = None, causal=False,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 window_size=(-1, -1), softcap=0.0,

This line binds or updates `window_size = (-1, -1), softcap=0.0,` for later source in FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `window_size = (-1, -1), softcap=0.0,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 alibi_slopes=None, deterministic=False,

This line binds or updates `alibi_slopes = None, deterministic=False,` for later source in FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `alibi_slopes = None, deterministic=False,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 return_attn_probs=False, block_table=None):

This line binds or updates `return_attn_probs = False, block_table=None):` for later source in FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `return_attn_probs = False, block_table=None):` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 return FlashAttnVarlenFunc.apply(

This line returns `return FlashAttnVarlenFunc.apply(` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `return FlashAttnVarlenFunc.apply(` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 q, k, v, cu_seqlens_q, cu_seqlens_k, max_seqlen_q, max_seqlen_k,

This exact expression `q, k, v, cu_seqlens_q, cu_seqlens_k, max_seqlen_q, max_seqlen_k,` contributes to the surrounding FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `q, k, v, cu_seqlens_q, cu_seqlens_k, max_seqlen_q, max_seqlen_k,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 dropout_p, softmax_scale, causal, window_size, softcap,

This signature line declares `dropout_p` as the requested attention-dropout probability.

Source
The caller must supply the requested attention-dropout probability.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 alibi_slopes, deterministic, return_attn_probs, block_table,

This exact expression `alibi_slopes, deterministic, return_attn_probs, block_table,` contributes to the surrounding FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `alibi_slopes, deterministic, return_attn_probs, block_table,` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 torch.is_grad_enabled())

This line invokes the call chain `torch.is_grad_enabled` when FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `torch.is_grad_enabled` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 21 Read this exact line
USE_TRITON_ROCM = os.getenv('FLASH_ATTENTION_TRITON_AMD_ENABLE', 'FALSE') == 'TRUE'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line calls `os.getenv(...)` and binds its returned value to `USE_TRITON_ROCM` for later use in FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.

Why this line could matter to useful work

This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Dao-AILab

Source path: not supplied

Revision: a8aa52b1ab3e9ca574c8a33b3f35afc017ffa2e2

V-001 kernel python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is FlashAttention-2 varlen dispatch into the compiled flash_attn_2_cuda extension.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-t5-attention-ops T5Attention forward: einsum plus softmax ATen ops, no FlashAttention on the text encoder 8 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

T5Attention forward: einsum plus softmax ATen ops, no FlashAttention on the text encoder

python

REGISTERED SOURCE · 8 DISPLAYED LINES

Source path not registered

     E01  q = self.q(x).view(b, -1, n, c)
     E02  k = self.k(context).view(b, -1, n, c)
     E03  v = self.v(context).view(b, -1, n, c)
     E04  ...
     E05  # compute attention (T5 does not use scaling)
     E06  attn = torch.einsum('binc,bjnc->bnij', q, k) + attn_bias
     E07  attn = F.softmax(attn.float(), dim=-1).type_as(attn)
     E08  x = torch.einsum('bnij,bjnc->binc', attn, v)

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 8 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 q = self.q(x).view(b, -1, n, c)

This line calls `self.q(...)` and binds its returned value to `q` for later use in T5Attention forward: einsum plus softmax ATen ops, no FlashAttention on the text encoder. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `q ← self.q(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 k = self.k(context).view(b, -1, n, c)

This line calls `self.k(...)` and binds its returned value to `k` for later use in T5Attention forward: einsum plus softmax ATen ops, no FlashAttention on the text encoder. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `k ← self.k(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 v = self.v(context).view(b, -1, n, c)

This line calls `self.v(...)` and binds its returned value to `v` for later use in T5Attention forward: einsum plus softmax ATen ops, no FlashAttention on the text encoder. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `v ← self.v(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # compute attention (T5 does not use scaling)

This comment documents `compute attention (T5 does not use scaling)` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 attn = torch.einsum('binc,bjnc->bnij', q, k) + attn_bias

This line calls `torch.einsum(...)` and binds its returned value to `attn` for later use in T5Attention forward: einsum plus softmax ATen ops, no FlashAttention on the text encoder. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `attn ← torch.einsum(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 attn = F.softmax(attn.float(), dim=-1).type_as(attn)

This line calls `F.softmax(...)` and binds its returned value to `attn` for later use in T5Attention forward: einsum plus softmax ATen ops, no FlashAttention on the text encoder. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `attn ← F.softmax(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 x = torch.einsum('bnij,bjnc->binc', attn, v)

This line calls `torch.einsum(...)` and binds its returned value to `x` for later use in T5Attention forward: einsum plus softmax ATen ops, no FlashAttention on the text encoder. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `x ← torch.einsum(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 8 Read this exact line
q = self.q(x).view(b, -1, n, c)
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line calls `self.q(...)` and binds its returned value to `q` for later use in T5Attention forward: einsum plus softmax ATen ops, no FlashAttention on the text encoder. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 operator python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: text-encode

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is T5Attention forward: einsum plus softmax ATen ops, no FlashAttention on the text encoder.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

wan22-vae-decoder-ops VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock 19 lines PINNED SOURCE / NOT EXECUTED

START HERE · SEE THE CODE FIRST

VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock

python

REGISTERED SOURCE · 19 DISPLAYED LINES

Source path not registered

     E01  class CausalConv3d(nn.Conv3d):
     E02      def forward(self, x, cache_x=None):
     E03          ...
     E04          x = F.pad(x, padding)
     E05          return super().forward(x)
     E06
     E07  class AttentionBlock(nn.Module):
     E08      """Causal self-attention with a single head."""
     E09      def forward(self, x):
     E10          ...
     E11          q, k, v = self.to_qkv(x).reshape(b * t, 1, c * 3, -1).permute(0, 1, 3, 2).contiguous().chunk(3, dim=-1)
     E12          x = F.scaled_dot_product_attention(q, k, v)
     E13          ...
     E14
     E15  class Decoder3d(nn.Module):
     E16      ...
     E17      self.middle = nn.Sequential(
     E18          ResidualBlock(dims[0], dims[0], dropout), AttentionBlock(dims[0]),
     E19          ResidualBlock(dims[0], dims[0], dropout))

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 19 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 class CausalConv3d(nn.Conv3d):

This line begins the `CausalConv3d` type used by VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock; its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CausalConv3d` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 def forward(self, x, cache_x=None):

This line begins the `forward` callable contract used by VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `forward` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 x = F.pad(x, padding)

This line calls `F.pad(...)` and binds its returned value to `x` for later use in VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `x ← F.pad(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 return super().forward(x)

This line returns `return super().forward(x)` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return super().forward(x)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 class AttentionBlock(nn.Module):

This line begins the `AttentionBlock` type used by VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock; its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `AttentionBlock` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 """Causal self-attention with a single head."""

This documentation line explains `Causal self-attention with a single head.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 def forward(self, x):

This line begins the `forward` callable contract used by VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `forward` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 q, k, v = self.to_qkv(x).reshape(b * t, 1, c * 3, -1).permute(0, 1, 3, 2).contiguous().chunk(3, dim=-1)

This line calls `self.to_qkv(...)` and binds its returned value to `v` for later use in VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `v ← self.to_qkv(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 x = F.scaled_dot_product_attention(q, k, v)

This line calls `F.scaled_dot_product_attention(...)` and binds its returned value to `x` for later use in VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `x ← F.scaled_dot_product_attention(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 class Decoder3d(nn.Module):

This line begins the `Decoder3d` type used by VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock; its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `Decoder3d` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 ...

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 self.middle = nn.Sequential(

This line calls `nn.Sequential(...)` and binds its returned value to `self.middle` for later use in VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `self.middle ← nn.Sequential(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 ResidualBlock(dims[0], dims[0], dropout), AttentionBlock(dims[0]),

This line invokes the call chain `ResidualBlock → AttentionBlock` when VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `ResidualBlock → AttentionBlock` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 ResidualBlock(dims[0], dims[0], dropout))

This line invokes the call chain `ResidualBlock` when VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `ResidualBlock` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 19 Read this exact line
class CausalConv3d(nn.Conv3d):
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line begins the `CausalConv3d` type used by VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock; its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: V-001 Wan2.2 walkthrough · Wan-Video

Source path: not supplied

Revision: 42bf4cfaa384bc21833865abc2f9e6c0e67233dc

V-001 operator python coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: vae-decode

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to V-001 Wan2.2 walkthrough. Its registered role is VAE Decoder3d ops: CausalConv3d convolutions plus a single-head SDPA AttentionBlock.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    The registered excerpt does not contain a joined dispatch, counter, output, and accepted-work receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for V-001. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

pytorch-backend-identity Detect the PyTorch CUDA or ROCm runtime 8 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Detect the PyTorch CUDA or ROCm runtime

python

REGISTERED SOURCE · 8 DISPLAYED LINES

Source path not registered

     E01  import torch
     E02
     E03  backend = (
     E04      "ROCm/HIP" if torch.version.hip else
     E05      "CUDA" if torch.version.cuda else
     E06      "CPU"
     E07  )
     E08  print({"backend": backend, "device": torch.cuda.get_device_name(0)})

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. Framework → selected CUDA or ROCm backendCANDIDATE LAYER
  3. Selected NVIDIA or AMD toolchainCANDIDATE LAYER
  4. Selected device queue and schedulerNOT CAPTURED
  5. NVIDIA SM / Tensor Core or AMD CU / MFMAPOSSIBLE
  6. Selected accelerator memory controller → Selected accelerator-local memory tierPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 8 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 import torch

This line imports `import torch` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import torch` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 backend = (

This line binds or updates `backend = (` for later source in Detect the PyTorch CUDA or ROCm runtime. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `backend = (` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 "ROCm/HIP" if torch.version.hip else

This exact expression `"ROCm/HIP" if torch.version.hip else` contributes to the surrounding Detect the PyTorch CUDA or ROCm runtime statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"ROCm/HIP" if torch.version.hip else` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 "CUDA" if torch.version.cuda else

This exact expression `"CUDA" if torch.version.cuda else` contributes to the surrounding Detect the PyTorch CUDA or ROCm runtime statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"CUDA" if torch.version.cuda else` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 "CPU"

This exact expression `"CPU"` contributes to the surrounding Detect the PyTorch CUDA or ROCm runtime statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"CPU"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 print({"backend": backend, "device": torch.cuda.get_device_name(0)})

This continuation line declares or passes `print({"backend": backend, "device": torch.cuda.get_device_name(0)})` as part of the surrounding call or signature in Detect the PyTorch CUDA or ROCm runtime. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `print({"backend": backend, "device": torch.cuda.get_device_name(0)})` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

Backend-selected accelerator path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 8 Read this exact line
import torch
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYFramework → selected CUDA or ROCm backend
  3. 03 · COMPILER / BINARYSelected NVIDIA or AMD toolchain
  4. 04 · GPU FRONT DOORSelected device queue and scheduler
  5. 05 · COMPUTE BLOCKNVIDIA SM / Tensor Core or AMD CU / MFMA
  6. 06 · ON-CHIP DATARegisters / VGPR → shared memory / LDS
  7. 07 · LAST-LEVEL CACHENVIDIA L2 or AMD Infinity Cache / L2
  8. 08 · MEMORY INTERFACESelected accelerator memory controller
  9. 09 · LOCAL MEMORYSelected accelerator-local memory tier
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line imports `import torch` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: Platform comparison walkthrough · Platform comparison walkthrough

Source path: not supplied

Revision: documentation reviewed 2026-07-12

comparison engine python coverage: parser_only observation: not_observed evidence: touchdown_derived
Indexed phases: identitylocal-memory

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to Platform comparison walkthrough. Its registered role is Detect the PyTorch CUDA or ROCm runtime.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Runtime identity does not prove native model, kernel, collective, or accepted-task support.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvidia-topology-qualification NVIDIA topology and collective qualification surface 3 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVIDIA topology and collective qualification surface

bash

REGISTERED SOURCE · 3 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

     E01  nvidia-smi topo -m
     E02  nvidia-smi nvlink --status
     E03  "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. Framework → selected CUDA or ROCm backendCANDIDATE LAYER
  3. Selected NVIDIA or AMD toolchainCANDIDATE LAYER
  4. Selected device queue and schedulerNOT CAPTURED
  5. NVIDIA SM / Tensor Core or AMD CU / MFMAPOSSIBLE
  6. Selected accelerator memory controller → Selected accelerator-local memory tierPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 3 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 nvidia-smi topo -m

This command records the host-visible NVIDIA device topology matrix in the receipt directory.

Source
The shell redirects `nvidia-smi topo -m` output to `nvidia-smi-topo.txt`.
Runtime / compiler
It inventories possible peer and host paths; it does not prove that the workload used one.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
Topology labels constrain possible movement paths but do not report bytes, link use, HBM traffic, or timing.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 nvidia-smi nvlink --status

This line invokes `nvidia-smi` in the NVIDIA topology and collective qualification surface source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding NVIDIA topology and collective qualification surface statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

Backend-selected accelerator path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 3 Read this exact line
nvidia-smi topo -m
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYFramework → selected CUDA or ROCm backend
  3. 03 · COMPILER / BINARYSelected NVIDIA or AMD toolchain
  4. 04 · GPU FRONT DOORSelected device queue and scheduler
  5. 05 · COMPUTE BLOCKNVIDIA SM / Tensor Core or AMD CU / MFMA
  6. 06 · ON-CHIP DATARegisters / VGPR → shared memory / LDS
  7. 07 · LAST-LEVEL CACHENVIDIA L2 or AMD Infinity Cache / L2
  8. 08 · MEMORY INTERFACESelected accelerator memory controller
  9. 09 · LOCAL MEMORYSelected accelerator-local memory tier
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This command records the host-visible NVIDIA device topology matrix in the receipt directory.

What changes next in software

It inventories possible peer and host paths; it does not prove that the workload used one.

What it means on the GPU

No kernel or GPU execution unit is selected.

How bytes could move

Topology labels constrain possible movement paths but do not report bytes, link use, HBM traffic, or timing.

Why this line could matter to useful work

This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: Platform comparison walkthrough · Platform comparison walkthrough

Source path: examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

Revision: not supplied

comparison profile bash coverage: fixture_backed observation: supported evidence: touchdown_derived
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to Platform comparison walkthrough. Its registered role is NVIDIA topology and collective qualification surface.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    This command surface does not prove one workload used the discovered links or achieved useful bandwidth.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-topology-qualification AMD topology and RCCL qualification surface 3 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

AMD topology and RCCL qualification surface

bash

REGISTERED SOURCE · 3 DISPLAYED LINES

Source path not registered

     E01  amd-smi list
     E02  amd-smi topology -a -w -o -t -b
     E03  "$RCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 3 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 amd-smi list

This line invokes `amd-smi` in the AMD topology and RCCL qualification surface source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `amd-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 amd-smi topology -a -w -o -t -b

This line invokes `amd-smi` in the AMD topology and RCCL qualification surface source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `amd-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 "$RCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$RCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding AMD topology and RCCL qualification surface statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `"$RCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 3 Read this exact line
amd-smi list
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `amd-smi` in the AMD topology and RCCL qualification surface source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: Platform comparison walkthrough · Platform comparison walkthrough

Source path: not supplied

Revision: AMD SMI 26.2.2 documentation reviewed 2026-07-12

comparison profile bash coverage: parser_only observation: not_observed evidence: touchdown_derived
Indexed phases: helios-c001helios-v001

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to Platform comparison walkthrough. Its registered role is AMD topology and RCCL qualification surface.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    The commands expose topology and a collective test surface; they do not prove Infinity Fabric routing, sustained application traffic, or an accepted task.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cross-vendor-topology-qualification NVIDIA and AMD topology qualification surfaces 9 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVIDIA and AMD topology qualification surfaces

bash

REGISTERED SOURCE · 9 DISPLAYED LINES

docs/content/drafts/2026-07-10-hbm-memory-first-publication-system/visuals/platform-memory-compare-contract.v1.json

     E01  # NVIDIA
     E02  nvidia-smi topo -m
     E03  nvidia-smi nvlink --status
     E04  "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E05
     E06  # AMD
     E07  amd-smi list
     E08  amd-smi topology -a -w -o -t -b
     E09  "$RCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. Framework → selected CUDA or ROCm backendCANDIDATE LAYER
  3. Selected NVIDIA or AMD toolchainCANDIDATE LAYER
  4. Selected device queue and schedulerNOT CAPTURED
  5. NVIDIA SM / Tensor Core or AMD CU / MFMAPOSSIBLE
  6. Selected accelerator memory controller → Selected accelerator-local memory tierPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 9 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 # NVIDIA

This comment documents `NVIDIA` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 nvidia-smi topo -m

This command records the host-visible NVIDIA device topology matrix in the receipt directory.

Source
The shell redirects `nvidia-smi topo -m` output to `nvidia-smi-topo.txt`.
Runtime / compiler
It inventories possible peer and host paths; it does not prove that the workload used one.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
Topology labels constrain possible movement paths but do not report bytes, link use, HBM traffic, or timing.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 nvidia-smi nvlink --status

This line invokes `nvidia-smi` in the NVIDIA and AMD topology qualification surfaces source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding NVIDIA and AMD topology qualification surfaces statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 # AMD

This comment documents `AMD` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 amd-smi list

This line invokes `amd-smi` in the NVIDIA and AMD topology qualification surfaces source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `amd-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 amd-smi topology -a -w -o -t -b

This line invokes `amd-smi` in the NVIDIA and AMD topology qualification surfaces source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `amd-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 "$RCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$RCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding NVIDIA and AMD topology qualification surfaces statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The evidence layer uses `"$RCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to configure or join profiler/trace collection.
Runtime / compiler
Instrumentation may wrap a target process and write a trace, report, or receipt; it can add overhead.
GPU execution
Profiler configuration observes rather than selects workload execution units.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

Backend-selected accelerator path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 9 Read this exact line
# NVIDIA
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYFramework → selected CUDA or ROCm backend
  3. 03 · COMPILER / BINARYSelected NVIDIA or AMD toolchain
  4. 04 · GPU FRONT DOORSelected device queue and scheduler
  5. 05 · COMPUTE BLOCKNVIDIA SM / Tensor Core or AMD CU / MFMA
  6. 06 · ON-CHIP DATARegisters / VGPR → shared memory / LDS
  7. 07 · LAST-LEVEL CACHENVIDIA L2 or AMD Infinity Cache / L2
  8. 08 · MEMORY INTERFACESelected accelerator memory controller
  9. 09 · LOCAL MEMORYSelected accelerator-local memory tier
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `NVIDIA` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: Platform comparison walkthrough · Platform comparison walkthrough

Source path: docs/content/drafts/2026-07-10-hbm-memory-first-publication-system/visuals/platform-memory-compare-contract.v1.json

Revision: not supplied

comparison profile bash coverage: parser_only observation: not_observed evidence: touchdown_derived
Indexed phases: software-fabricrack-topology
No separate source URL registered

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to Platform comparison walkthrough. Its registered role is NVIDIA and AMD topology qualification surfaces.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Run the vendor-matched path on pinned hardware. Command availability and a microbenchmark are not an accepted-workload receipt.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocm-memory-stack-qualification Inspect the AMD runtime, memory, operator, artifact, and profiler boundaries 5 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Inspect the AMD runtime, memory, operator, artifact, and profiler boundaries

bash

REGISTERED SOURCE · 5 DISPLAYED LINES

docs/content/drafts/2026-07-10-hbm-memory-first-publication-system/visuals/amd-rocm-memory-library-contract.v1.json

     E01  rocminfo
     E02  hipconfig --full
     E03  amd-smi static --asic --vram
     E04  # Then run the exact row-specific command from the AMD ROCm memory packet.
     E05  # Save the selected operator, HSACO digest, dispatch, HBM counters, output, verifier, and run_id together.

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 5 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 rocminfo

This line invokes `rocminfo` in the Inspect the AMD runtime, memory, operator, artifact, and profiler boundaries source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `rocminfo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 hipconfig --full

This line invokes `hipconfig` in the Inspect the AMD runtime, memory, operator, artifact, and profiler boundaries source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `hipconfig` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 amd-smi static --asic --vram

This line invokes `amd-smi` in the Inspect the AMD runtime, memory, operator, artifact, and profiler boundaries source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `amd-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Then run the exact row-specific command from the AMD ROCm memory packet.

This comment documents `Then run the exact row-specific command from the AMD ROCm memory packet.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # Save the selected operator, HSACO digest, dispatch, HBM counters, output, verifier, and run_id together.

This comment documents `Save the selected operator, HSACO digest, dispatch, HBM counters, output, verifier, and…` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 5 Read this exact line
rocminfo
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `rocminfo` in the Inspect the AMD runtime, memory, operator, artifact, and profiler boundaries source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: Platform comparison walkthrough · Platform comparison walkthrough

Source path: docs/content/drafts/2026-07-10-hbm-memory-first-publication-system/visuals/amd-rocm-memory-library-contract.v1.json

Revision: not supplied

comparison operator bash coverage: parser_only observation: not_observed evidence: touchdown_derived
Indexed phases: software-fabrichelios-c001helios-v001
No separate source URL registered

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to Platform comparison walkthrough. Its registered role is Inspect the AMD runtime, memory, operator, artifact, and profiler boundaries.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    These identity commands do not prove which operator, device object, collective, or physical HBM path the workload selected.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-device-artifact-boundary Pin the AMDGPU target and device-object identity 4 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Pin the AMDGPU target and device-object identity

bash

REGISTERED SOURCE · 4 DISPLAYED LINES

Source path not registered

     E01  test -n "${AMD_GPU_TARGET:-}" || { echo 'Pin the exact AMDGPU target before compiling' >&2; exit 1; }
     E02  hipcc --offload-arch="$AMD_GPU_TARGET" -save-temps workload.cpp -o workload
     E03  llvm-readelf --notes ./*.hsaco
     E04  llvm-objdump --disassemble --mcpu="$AMD_GPU_TARGET" ./*.hsaco

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 4 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 test -n "${AMD_GPU_TARGET:-}" || { echo 'Pin the exact AMDGPU target before compiling' >&2; exit 1; }

This line invokes `test` in the Pin the AMDGPU target and device-object identity source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 hipcc --offload-arch="$AMD_GPU_TARGET" -save-temps workload.cpp -o workload

This line invokes `hipcc` in the Pin the AMDGPU target and device-object identity source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `hipcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 llvm-readelf --notes ./*.hsaco

This line invokes `llvm-readelf` in the Pin the AMDGPU target and device-object identity source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `llvm-readelf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 llvm-objdump --disassemble --mcpu="$AMD_GPU_TARGET" ./*.hsaco

This line invokes `llvm-objdump` in the Pin the AMDGPU target and device-object identity source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `llvm-objdump` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 4 Read this exact line
test -n "${AMD_GPU_TARGET:-}" || { echo 'Pin the exact AMDGPU target before compiling' >&2; exit 1; }
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `test` in the Pin the AMDGPU target and device-object identity source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: Platform comparison walkthrough · Platform comparison walkthrough

Source path: not supplied

Revision: documentation reviewed 2026-07-22

comparison ir-ptx bash coverage: parser_only observation: not_observed evidence: touchdown_derived
Indexed phases: software-fabrichelios-c001helios-v001

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to Platform comparison walkthrough. Its registered role is Pin the AMDGPU target and device-object identity.
  1. 01 · BEFOREWhat enters

    Framework graphs, operator definitions, specialization parameters, and compiler options.

  2. 02 · THIS SOURCEWhat role it owns

    Represents the compiler boundary between high-level operations and a target-specific executable.

  3. 03 · AFTERWhat leaves

    IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

  4. 04 · VALUEWhy anyone cares

    Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

  5. 05 · PROOFWhat is still missing

    The command is a qualification template. No MI455X compiler target, HSACO, dispatch, or disassembly has been captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the ir-ptx layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Represents the compiler boundary between high-level operations and a target-specific executable. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Framework graphs, operator definitions, specialization parameters, and compiler options. Output boundary: IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cudnn-graph-matmul cuDNN Frontend Graph matmul 40 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuDNN Frontend Graph matmul

python

REGISTERED SOURCE · 40 DISPLAYED LINES

examples/hbm-learning-journey/extensions/code-planes/cudnn_graph_matmul.py

     E01  #!/usr/bin/env python3
     E02  """cuDNN Frontend graph boundary, adapted from NVIDIA's official quick start.
     E03
     E04  Coverage is parser_only. Import, graph build, execution, and numerics require a
     E05  pinned CUDA/cuDNN/PyTorch environment and have not been observed here.
     E06  """
     E07
     E08  import cudnn
     E09  import torch
     E10
     E11
     E12  def run() -> dict[str, object]:
     E13      batch, m, n, k = 16, 32, 64, 128
     E14      a = torch.randn(batch, m, k, device="cuda", dtype=torch.bfloat16)
     E15      b = torch.randn(1, k, n, device="cuda", dtype=torch.bfloat16)
     E16
     E17      # Host: describe a persistent operation graph and its precision contract.
     E18      with cudnn.Graph(
     E19          io_data_type=torch.bfloat16,
     E20          compute_data_type=torch.float32,
     E21          inputs=["matmul::A", "matmul::B"],
     E22          outputs=["out"],
     E23      ) as graph:
     E24          output = graph.matmul(name="matmul", A=a, B=b)
     E25          output.set_name("out").set_output(True)
     E26
     E27      # Device: the built graph chooses supported cuDNN engine(s) and launches.
     E28      candidate = graph(a, b, handle=cudnn.create_handle())
     E29      reference = torch.matmul(a.float(), b.float()).to(torch.bfloat16)
     E30      return {
     E31          "shape": list(candidate.shape),
     E32          "matches": bool(torch.allclose(candidate, reference, atol=1e-2, rtol=1e-2)),
     E33          "max_abs_error": float((candidate - reference).abs().max()),
     E34      }
     E35
     E36
     E37  if __name__ == "__main__":
     E38      print(run())
     E39
     E40  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 40 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """cuDNN Frontend graph boundary, adapted from NVIDIA's official quick start.

This documentation line explains `cuDNN Frontend graph boundary, adapted from NVIDIA's official quick start.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 Coverage is parser_only. Import, graph build, execution, and numerics require a

This exact expression `Coverage is parser_only. Import, graph build, execution, and numerics require a` contributes to the surrounding cuDNN Frontend Graph matmul statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `Coverage is parser_only. Import, graph build, execution, and numerics require a` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 pinned CUDA/cuDNN/PyTorch environment and have not been observed here.

This exact expression `pinned CUDA/cuDNN/PyTorch environment and have not been observed here.` contributes to the surrounding cuDNN Frontend Graph matmul statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `pinned CUDA/cuDNN/PyTorch environment and have not been observed here.` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 """

This documentation line explains ``; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 import cudnn

This line imports `import cudnn` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import cudnn` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 import torch

This line imports `import torch` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import torch` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 def run() -> dict[str, object]:

This line begins the `run` callable contract used by cuDNN Frontend Graph matmul; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `run` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 batch, m, n, k = 16, 32, 64, 128

This line binds or updates `k = 16, 32, 64, 128` for later source in cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `k = 16, 32, 64, 128` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 a = torch.randn(batch, m, k, device="cuda", dtype=torch.bfloat16)

This line calls `torch.randn(...)` and binds its returned value to `a` for later use in cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `a ← torch.randn(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 b = torch.randn(1, k, n, device="cuda", dtype=torch.bfloat16)

This line calls `torch.randn(...)` and binds its returned value to `b` for later use in cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `b ← torch.randn(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 # Host: describe a persistent operation graph and its precision contract.

This comment documents `Host: describe a persistent operation graph and its precision contract.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 with cudnn.Graph(

This line invokes the call chain `cudnn.Graph` when cuDNN Frontend Graph matmul executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cudnn.Graph` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 io_data_type=torch.bfloat16,

This line binds or updates `io_data_type = torch.bfloat16,` for later source in cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `io_data_type = torch.bfloat16,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 compute_data_type=torch.float32,

This line binds or updates `compute_data_type = torch.float32,` for later source in cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `compute_data_type = torch.float32,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 inputs=["matmul::A", "matmul::B"],

This line binds or updates `inputs = ["matmul::A", "matmul::B"],` for later source in cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `inputs = ["matmul::A", "matmul::B"],` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 outputs=["out"],

This line binds or updates `outputs = ["out"],` for later source in cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `outputs = ["out"],` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 ) as graph:

This exact expression `) as graph:` contributes to the surrounding cuDNN Frontend Graph matmul statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `) as graph:` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 output = graph.matmul(name="matmul", A=a, B=b)

This line calls `graph.matmul(...)` and binds its returned value to `output` for later use in cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `output ← graph.matmul(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 output.set_name("out").set_output(True)

This line invokes the call chain `output.set_name → set_output` when cuDNN Frontend Graph matmul executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `output.set_name → set_output` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 # Device: the built graph chooses supported cuDNN engine(s) and launches.

This comment documents `Device: the built graph chooses supported cuDNN engine(s) and launches.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 candidate = graph(a, b, handle=cudnn.create_handle())

This line calls `graph(...)` and binds its returned value to `candidate` for later use in cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `candidate ← graph(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 reference = torch.matmul(a.float(), b.float()).to(torch.bfloat16)

This line calls `torch.matmul(...)` and binds its returned value to `reference` for later use in cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `reference ← torch.matmul(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 return {

This line returns `return {` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 "shape": list(candidate.shape),

This line declares `shape = list(candidate.shape)` as an exact configuration value used by cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `shape = list(candidate.shape)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 "matches": bool(torch.allclose(candidate, reference, atol=1e-2, rtol=1e-2)),

This line declares `matches = bool(torch.allclose(candidate, reference, atol=1e-2, rtol=1e-2))` as an exact configuration value used by cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `matches = bool(torch.allclose(candidate, reference, atol=1e-2, rtol=1e-2))` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 "max_abs_error": float((candidate - reference).abs().max()),

This line declares `max_abs_error = float((candidate - reference).abs().max())` as an exact configuration value used by cuDNN Frontend Graph matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `max_abs_error = float((candidate - reference).abs().max())` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if __name__ == "__main__":` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 print(run())

This line invokes the call chain `print → run` when cuDNN Frontend Graph matmul executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `print → run` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 40 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/extensions/code-planes/cudnn_graph_matmul.py

Revision: not supplied

shared operator python coverage: parser_only observation: not_observed evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is inspectable_source.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Source code identifies a possible software-to-kernel path. It does not determine executed kernel identity, bytes moved, link traffic, power, heat, cooling energy, water consumption, or cost without joined runtime and facility receipts.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cutlass-cpp-gemm CUTLASS C++ device GEMM 37 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUTLASS C++ device GEMM

cuda c++

REGISTERED SOURCE · 37 DISPLAYED LINES

examples/hbm-learning-journey/extensions/code-planes/cutlass_gemm.cu

     E01  // CUTLASS v4.5.1 teaching path. Coverage: parser_only, not GPU-observed.
     E02  #include <cutlass/cutlass.h>
     E03  #include <cutlass/gemm/device/gemm.h>
     E04  #include <cutlass/layout/matrix.h>
     E05  #include <cutlass/util/device_memory.h>
     E06
     E07  #include <iostream>
     E08
     E09  int main() {
     E10    int const m = 128, n = 128, k = 128;
     E11    cutlass::device_memory::allocation<float> a(m * k);
     E12    cutlass::device_memory::allocation<float> b(k * n);
     E13    cutlass::device_memory::allocation<float> c(m * n);
     E14
     E15    using Gemm = cutlass::gemm::device::Gemm<
     E16        float, cutlass::layout::RowMajor,
     E17        float, cutlass::layout::RowMajor,
     E18        float, cutlass::layout::RowMajor>;
     E19
     E20    Gemm operation;
     E21    Gemm::Arguments arguments(
     E22        {m, n, k},
     E23        {a.get(), k},
     E24        {b.get(), n},
     E25        {c.get(), n},
     E26        {c.get(), n},
     E27        {1.0F, 0.0F});
     E28
     E29    auto status = operation.can_implement(arguments);
     E30    if (status != cutlass::Status::kSuccess) return 2;
     E31    status = operation(arguments);
     E32    if (status != cutlass::Status::kSuccess) return 3;
     E33    std::cout << "CUTLASS GEMM launch accepted; numerical receipt still required\n";
     E34    return 0;
     E35  }
     E36
     E37  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 37 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 // CUTLASS v4.5.1 teaching path. Coverage: parser_only, not GPU-observed.

This comment documents `CUTLASS v4.5.1 teaching path. Coverage: parser_only, not GPU-observed.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 #include <cutlass/cutlass.h>

This comment documents `include <cutlass/cutlass.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cutlass/gemm/device/gemm.h>

This comment documents `include <cutlass/gemm/device/gemm.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <cutlass/layout/matrix.h>

This comment documents `include <cutlass/layout/matrix.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 #include <cutlass/util/device_memory.h>

This comment documents `include <cutlass/util/device_memory.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 #include <iostream>

This comment documents `include <iostream>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 int main() {

This line invokes the call chain `main` when CUTLASS C++ device GEMM executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `main` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 int const m = 128, n = 128, k = 128;

This line binds or updates `m = 128, n = 128, k = 128` for later source in CUTLASS C++ device GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `m = 128, n = 128, k = 128` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 cutlass::device_memory::allocation<float> a(m * k);

This continuation line declares or passes `cutlass::device_memory::allocation<float> a(m * k);` as part of the surrounding call or signature in CUTLASS C++ device GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `cutlass::device_memory::allocation<float> a(m * k);` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 cutlass::device_memory::allocation<float> b(k * n);

This continuation line declares or passes `cutlass::device_memory::allocation<float> b(k * n);` as part of the surrounding call or signature in CUTLASS C++ device GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `cutlass::device_memory::allocation<float> b(k * n);` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 cutlass::device_memory::allocation<float> c(m * n);

This continuation line declares or passes `cutlass::device_memory::allocation<float> c(m * n);` as part of the surrounding call or signature in CUTLASS C++ device GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `cutlass::device_memory::allocation<float> c(m * n);` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 using Gemm = cutlass::gemm::device::Gemm<

This line binds or updates `Gemm = cutlass::gemm::device::Gemm<` for later source in CUTLASS C++ device GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `Gemm = cutlass::gemm::device::Gemm<` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 float, cutlass::layout::RowMajor,

This continuation line declares or passes `float, cutlass::layout::RowMajor` as part of the surrounding call or signature in CUTLASS C++ device GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `float, cutlass::layout::RowMajor` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 float, cutlass::layout::RowMajor,

This continuation line declares or passes `float, cutlass::layout::RowMajor` as part of the surrounding call or signature in CUTLASS C++ device GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `float, cutlass::layout::RowMajor` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 float, cutlass::layout::RowMajor>;

This exact expression `float, cutlass::layout::RowMajor>;` contributes to the surrounding CUTLASS C++ device GEMM statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `float, cutlass::layout::RowMajor>;` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 Gemm operation;

This exact expression `Gemm operation;` contributes to the surrounding CUTLASS C++ device GEMM statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `Gemm operation;` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 Gemm::Arguments arguments(

This continuation line declares or passes `Gemm::Arguments arguments(` as part of the surrounding call or signature in CUTLASS C++ device GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `Gemm::Arguments arguments(` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 {m, n, k},

This exact expression `{m, n, k},` contributes to the surrounding CUTLASS C++ device GEMM statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `{m, n, k},` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 {a.get(), k},

This line invokes the call chain `a.get` when CUTLASS C++ device GEMM executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `a.get` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 {b.get(), n},

This line invokes the call chain `b.get` when CUTLASS C++ device GEMM executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `b.get` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 {c.get(), n},

This line invokes the call chain `c.get` when CUTLASS C++ device GEMM executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `c.get` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 {c.get(), n},

This line invokes the call chain `c.get` when CUTLASS C++ device GEMM executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `c.get` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 {1.0F, 0.0F});

This exact expression `{1.0F, 0.0F});` contributes to the surrounding CUTLASS C++ device GEMM statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `{1.0F, 0.0F});` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 auto status = operation.can_implement(arguments);

This line calls `operation.can_implement(...)` and binds its returned value to `status` for later use in CUTLASS C++ device GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `status ← operation.can_implement(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 if (status != cutlass::Status::kSuccess) return 2;

This line selects a control path using `if (status != cutlass::Status::kSuccess) return 2;` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if (status != cutlass::Status::kSuccess) return 2;` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 status = operation(arguments);

This line calls `operation(...)` and binds its returned value to `status` for later use in CUTLASS C++ device GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `status ← operation(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 if (status != cutlass::Status::kSuccess) return 3;

This line selects a control path using `if (status != cutlass::Status::kSuccess) return 3;` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if (status != cutlass::Status::kSuccess) return 3;` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 std::cout << "CUTLASS GEMM launch accepted; numerical receipt still required\n";

This continuation line declares or passes `std::cout << "CUTLASS GEMM launch accepted; numerical receipt still required\n";` as part of the surrounding call or signature in CUTLASS C++ device GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `std::cout << "CUTLASS GEMM launch accepted; numerical receipt still required\n";` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 return 0;

This line returns `return 0;` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `return 0;` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 37 Read this exact line
// CUTLASS v4.5.1 teaching path. Coverage: parser_only, not GPU-observed.
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `CUTLASS v4.5.1 teaching path. Coverage: parser_only, not GPU-observed.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/extensions/code-planes/cutlass_gemm.cu

Revision: not supplied

shared kernel cuda c++ coverage: parser_only observation: not_observed evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda c++ excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is inspectable_source.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Source code identifies a possible software-to-kernel path. It does not determine executed kernel identity, bytes moved, link traffic, power, heat, cooling energy, water consumption, or cost without joined runtime and facility receipts.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cute-dsl-gemm CuTe DSL GEMM source map 41 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CuTe DSL GEMM source map

python

REGISTERED SOURCE · 41 DISPLAYED LINES

examples/hbm-learning-journey/extensions/code-planes/cute_dsl_gemm_map.py

     E01  #!/usr/bin/env python3
     E02  """Inspectable map to the full pinned CuTe DSL GEMM implementation.
     E03
     E04  CuTe DSL GEMM is not honestly reducible to a few lines: the implementation
     E05  must define layouts, tiled copies, MMA atoms, pipelines, synchronization, and a
     E06  host launcher. The pinned CUTLASS source is the executable authority. This file
     E07  keeps those boundaries visible without inventing a fake kernel.
     E08  """
     E09
     E10  PINNED_SOURCE = (
     E11      "https://github.com/NVIDIA/cutlass/tree/v4.5.1/"
     E12      "examples/python/CuTeDSL"
     E13  )
     E14
     E15  COMPILATION_PATH = (
     E16      "Python @cute.jit host launcher",
     E17      "tensor/layout construction",
     E18      "@cute.kernel GPU function",
     E19      "global-to-shared tiled copy",
     E20      "shared-to-register tiled copy",
     E21      "cute.gemm over an MMA atom",
     E22      "epilogue store",
     E23      "CuTe MLIR and NVIDIA lowering",
     E24      "PTX and target machine code",
     E25  )
     E26
     E27
     E28  def inspect() -> dict[str, object]:
     E29      return {
     E30          "source": PINNED_SOURCE,
     E31          "path": COMPILATION_PATH,
     E32          "coverage_state": "parser_only",
     E33          "observation_state": "not_observed",
     E34          "reason": "Full official kernel is pinned; no local GPU artifact exists.",
     E35      }
     E36
     E37
     E38  if __name__ == "__main__":
     E39      print(inspect())
     E40
     E41  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 41 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """Inspectable map to the full pinned CuTe DSL GEMM implementation.

This documentation line explains `Inspectable map to the full pinned CuTe DSL GEMM implementation.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 CuTe DSL GEMM is not honestly reducible to a few lines: the implementation

This exact expression `CuTe DSL GEMM is not honestly reducible to a few lines: the implementation` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `CuTe DSL GEMM is not honestly reducible to a few lines: the implementation` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 must define layouts, tiled copies, MMA atoms, pipelines, synchronization, and a

This exact expression `must define layouts, tiled copies, MMA atoms, pipelines, synchronization, and a` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `must define layouts, tiled copies, MMA atoms, pipelines, synchronization, and a` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 host launcher. The pinned CUTLASS source is the executable authority. This file

This exact expression `host launcher. The pinned CUTLASS source is the executable authority. This file` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `host launcher. The pinned CUTLASS source is the executable authority. This file` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 keeps those boundaries visible without inventing a fake kernel.

This exact expression `keeps those boundaries visible without inventing a fake kernel.` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `keeps those boundaries visible without inventing a fake kernel.` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 """

This documentation line explains ``; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 PINNED_SOURCE = (

This line binds or updates `PINNED_SOURCE = (` for later source in CuTe DSL GEMM source map. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `PINNED_SOURCE = (` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 "https://github.com/NVIDIA/cutlass/tree/v4.5.1/"

This exact expression `"https://github.com/NVIDIA/cutlass/tree/v4.5.1/"` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `"https://github.com/NVIDIA/cutlass/tree/v4.5.1/"` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 "examples/python/CuTeDSL"

This exact expression `"examples/python/CuTeDSL"` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `"examples/python/CuTeDSL"` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 COMPILATION_PATH = (

This line binds or updates `COMPILATION_PATH = (` for later source in CuTe DSL GEMM source map. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `COMPILATION_PATH = (` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 "Python @cute.jit host launcher",

This exact expression `"Python @cute.jit host launcher",` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `"Python @cute.jit host launcher",` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 "tensor/layout construction",

This exact expression `"tensor/layout construction",` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `"tensor/layout construction",` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 "@cute.kernel GPU function",

This exact expression `"@cute.kernel GPU function",` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `"@cute.kernel GPU function",` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 "global-to-shared tiled copy",

This exact expression `"global-to-shared tiled copy",` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `"global-to-shared tiled copy",` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 "shared-to-register tiled copy",

This exact expression `"shared-to-register tiled copy",` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `"shared-to-register tiled copy",` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 "cute.gemm over an MMA atom",

This exact expression `"cute.gemm over an MMA atom",` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `"cute.gemm over an MMA atom",` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 "epilogue store",

This exact expression `"epilogue store",` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `"epilogue store",` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 "CuTe MLIR and NVIDIA lowering",

This exact expression `"CuTe MLIR and NVIDIA lowering",` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `"CuTe MLIR and NVIDIA lowering",` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 "PTX and target machine code",

This exact expression `"PTX and target machine code",` contributes to the surrounding CuTe DSL GEMM source map statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `"PTX and target machine code",` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 def inspect() -> dict[str, object]:

This line begins the `inspect` callable contract used by CuTe DSL GEMM source map; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `inspect` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 return {

This line returns `return {` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `return {` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 "source": PINNED_SOURCE,

This line declares `source = PINNED_SOURCE` as an exact configuration value used by CuTe DSL GEMM source map. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `source = PINNED_SOURCE` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 "path": COMPILATION_PATH,

This line declares `path = COMPILATION_PATH` as an exact configuration value used by CuTe DSL GEMM source map. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `path = COMPILATION_PATH` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 "coverage_state": "parser_only",

This line declares `coverage_state = "parser_only"` as an exact configuration value used by CuTe DSL GEMM source map. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `coverage_state = "parser_only"` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 "observation_state": "not_observed",

This line declares `observation_state = "not_observed"` as an exact configuration value used by CuTe DSL GEMM source map. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `observation_state = "not_observed"` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 "reason": "Full official kernel is pinned; no local GPU artifact exists.",

This line declares `reason = "Full official kernel is pinned; no local GPU artifact exists."` as an exact configuration value used by CuTe DSL GEMM source map. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `reason = "Full official kernel is pinned; no local GPU artifact exists."` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if __name__ == "__main__":` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 print(inspect())

This line invokes the call chain `print → inspect` when CuTe DSL GEMM source map executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `print → inspect` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 41 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/extensions/code-planes/cute_dsl_gemm_map.py

Revision: not supplied

shared kernel python coverage: parser_only observation: not_observed evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is source_map.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Source code identifies a possible software-to-kernel path. It does not determine executed kernel identity, bytes moved, link traffic, power, heat, cooling energy, water consumption, or cost without joined runtime and facility receipts.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

tilelang-gemm TileLang tiled GEMM 29 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

TileLang tiled GEMM

python dsl

REGISTERED SOURCE · 29 DISPLAYED LINES

examples/hbm-learning-journey/extensions/code-planes/tilelang_gemm.py

     E01  #!/usr/bin/env python3
     E02  """TileLang GEMM teaching kernel based on the v0.1.10 quick-start structure."""
     E03
     E04  import tilelang
     E05  import tilelang.language as T
     E06
     E07
     E08  @tilelang.jit
     E09  def matmul(a, b, block_m: int = 64, block_n: int = 64, block_k: int = 64):
     E10      m, n, k = T.const("M, N, K")
     E11      a: T.Tensor[[m, k], T.float16]
     E12      b: T.Tensor[[k, n], T.float16]
     E13      output = T.empty([m, n], T.float16)
     E14      with T.Kernel(T.ceildiv(n, block_n), T.ceildiv(m, block_m), threads=128) as (bx, by):
     E15          a_shared = T.alloc_shared((block_m, block_k), T.float16)
     E16          b_shared = T.alloc_shared((block_k, block_n), T.float16)
     E17          accumulator = T.alloc_fragment((block_m, block_n), T.float32)
     E18          T.clear(accumulator)
     E19          for ko in T.Pipelined(T.ceildiv(k, block_k), num_stages=3):
     E20              T.copy(a[by * block_m, ko * block_k], a_shared)
     E21              T.copy(b[ko * block_k, bx * block_n], b_shared)
     E22              T.gemm(a_shared, b_shared, accumulator)
     E23          T.copy(accumulator, output[by * block_m, bx * block_n])
     E24      return output
     E25
     E26
     E27  if __name__ == "__main__":
     E28      raise SystemExit("parser_only: pin a target, shapes, tensors, and reference before running")
     E29  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 29 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """TileLang GEMM teaching kernel based on the v0.1.10 quick-start structure."""

This documentation line explains `TileLang GEMM teaching kernel based on the v0.1.10 quick-start structure.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 import tilelang

This line imports `import tilelang` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import tilelang` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 import tilelang.language as T

This line imports `import tilelang.language as T` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import tilelang.language as T` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 @tilelang.jit

This line attaches `tilelang.jit` metadata or compilation behavior to the definition that follows. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `tilelang.jit` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 def matmul(a, b, block_m: int = 64, block_n: int = 64, block_k: int = 64):

This line begins the `matmul` callable contract used by TileLang tiled GEMM; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `matmul` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 m, n, k = T.const("M, N, K")

This line calls `T.const(...)` and binds its returned value to `k` for later use in TileLang tiled GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `k ← T.const(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 a: T.Tensor[[m, k], T.float16]

This continuation line declares or passes `a: T.Tensor[[m, k], T.float16]` as part of the surrounding call or signature in TileLang tiled GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `a: T.Tensor[[m, k], T.float16]` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 b: T.Tensor[[k, n], T.float16]

This continuation line declares or passes `b: T.Tensor[[k, n], T.float16]` as part of the surrounding call or signature in TileLang tiled GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `b: T.Tensor[[k, n], T.float16]` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 output = T.empty([m, n], T.float16)

This line calls `T.empty(...)` and binds its returned value to `output` for later use in TileLang tiled GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `output ← T.empty(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 with T.Kernel(T.ceildiv(n, block_n), T.ceildiv(m, block_m), threads=128) as (bx, by):

This line calls `as(...)` and binds its returned value to `threads` for later use in TileLang tiled GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `threads ← as(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 a_shared = T.alloc_shared((block_m, block_k), T.float16)

This line calls `T.alloc_shared(...)` and binds its returned value to `a_shared` for later use in TileLang tiled GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `a_shared ← T.alloc_shared(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 b_shared = T.alloc_shared((block_k, block_n), T.float16)

This line calls `T.alloc_shared(...)` and binds its returned value to `b_shared` for later use in TileLang tiled GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `b_shared ← T.alloc_shared(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 accumulator = T.alloc_fragment((block_m, block_n), T.float32)

This line calls `T.alloc_fragment(...)` and binds its returned value to `accumulator` for later use in TileLang tiled GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `accumulator ← T.alloc_fragment(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 T.clear(accumulator)

This line invokes the call chain `T.clear` when TileLang tiled GEMM executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `T.clear` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 for ko in T.Pipelined(T.ceildiv(k, block_k), num_stages=3):

This line begins the repeated control path `for ko in T.Pipelined(T.ceildiv(k, block_k), num_stages=3):` inside TileLang tiled GEMM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `for ko in T.Pipelined(T.ceildiv(k, block_k), num_stages=3):` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 T.copy(a[by * block_m, ko * block_k], a_shared)

This line invokes the call chain `T.copy` when TileLang tiled GEMM executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `T.copy` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 T.copy(b[ko * block_k, bx * block_n], b_shared)

This line invokes the call chain `T.copy` when TileLang tiled GEMM executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `T.copy` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 T.gemm(a_shared, b_shared, accumulator)

This line invokes the call chain `T.gemm` when TileLang tiled GEMM executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `T.gemm` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 T.copy(accumulator, output[by * block_m, bx * block_n])

This line invokes the call chain `T.copy` when TileLang tiled GEMM executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `T.copy` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 return output

This line returns `return output` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `return output` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if __name__ == "__main__":` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 raise SystemExit("parser_only: pin a target, shapes, tensors, and reference before running")

This line enforces `raise SystemExit("parser_only: pin a target, shapes, tensors, and reference before runn…` and stops or rejects the path when the condition fails. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `raise SystemExit("parser_only: pin a target, shapes, tensors, and reference before runn…` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 29 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · TileLang project

Source path: examples/hbm-learning-journey/extensions/code-planes/tilelang_gemm.py

Revision: not supplied

shared kernel python dsl coverage: parser_only observation: not_observed evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python dsl excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is inspectable_source.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Source code identifies a possible software-to-kernel path. It does not determine executed kernel identity, bytes moved, link traffic, power, heat, cooling energy, water consumption, or cost without joined runtime and facility receipts.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

gluon-copy Gluon scalar-copy kernel 25 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Gluon scalar-copy kernel

python dsl

REGISTERED SOURCE · 25 DISPLAYED LINES

examples/hbm-learning-journey/extensions/code-planes/gluon_copy.py

     E01  #!/usr/bin/env python3
     E02  """Smallest official Gluon boundary: Python launcher to one GPU kernel."""
     E03
     E04  import torch
     E05  from triton.experimental import gluon
     E06  from triton.experimental.gluon import language as gl
     E07
     E08
     E09  @gluon.jit
     E10  def copy_scalar_kernel(input_pointer, output_pointer):
     E11      value = gl.load(input_pointer)
     E12      gl.store(output_pointer, value)
     E13
     E14
     E15  def run() -> torch.Tensor:
     E16      source = torch.tensor([1.0], device="cuda")
     E17      destination = torch.empty_like(source)
     E18      copy_scalar_kernel[(1,)](source, destination)
     E19      return destination
     E20
     E21
     E22  if __name__ == "__main__":
     E23      print(run())
     E24
     E25  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 25 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """Smallest official Gluon boundary: Python launcher to one GPU kernel."""

This documentation line explains `Smallest official Gluon boundary: Python launcher to one GPU kernel.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 import torch

This line imports `import torch` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import torch` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 from triton.experimental import gluon

This line imports `from triton.experimental import gluon` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `from triton.experimental import gluon` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 from triton.experimental.gluon import language as gl

This line imports `from triton.experimental.gluon import language as gl` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `from triton.experimental.gluon import language as gl` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 @gluon.jit

This line attaches `gluon.jit` metadata or compilation behavior to the definition that follows. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `gluon.jit` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 def copy_scalar_kernel(input_pointer, output_pointer):

This line begins the `copy_scalar_kernel` callable contract used by Gluon scalar-copy kernel; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `copy_scalar_kernel` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 value = gl.load(input_pointer)

This Gluon kernel line loads the value addressed by in_ptr into a program value.

Source
The DSL represents a device-side load from the pointer operand.
Runtime / compiler
Gluon/Triton lowering turns the load into target-specific device instructions if the kernel is compiled.
GPU execution
A launched program instance would issue the load from GPU threads; the exact warp, SM, and instruction are not captured.
Memory path
The access may hit a cache or reach device memory/HBM; address, width, cache outcome, and bytes require compilation and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 gl.store(output_pointer, value)

This Gluon kernel line stores the program value to the address carried by out_ptr.

Source
The DSL represents a device-side store to the pointer operand.
Runtime / compiler
Gluon/Triton lowering emits target-specific store instructions if the kernel is compiled.
GPU execution
A launched program instance would issue the store; exact warp, SM, and instruction are not captured.
Memory path
The write may pass through cache and eventually device memory/HBM; address, width, writeback behavior, and bytes require a run.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 def run() -> torch.Tensor:

This line begins the `run` callable contract used by Gluon scalar-copy kernel; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `run` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 source = torch.tensor([1.0], device="cuda")

This line calls `torch.tensor(...)` and binds its returned value to `source` for later use in Gluon scalar-copy kernel. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `source ← torch.tensor(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 destination = torch.empty_like(source)

This line calls `torch.empty_like(...)` and binds its returned value to `destination` for later use in Gluon scalar-copy kernel. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `destination ← torch.empty_like(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 copy_scalar_kernel[(1,)](source, destination)

This exact expression `copy_scalar_kernel[(1,)](source, destination)` contributes to the surrounding Gluon scalar-copy kernel statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `copy_scalar_kernel[(1,)](source, destination)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 return destination

This line returns `return destination` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `return destination` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if __name__ == "__main__":` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 print(run())

This line invokes the call chain `print → run` when Gluon scalar-copy kernel executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `print → run` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 25 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · Triton project

Source path: examples/hbm-learning-journey/extensions/code-planes/gluon_copy.py

Revision: not supplied

shared kernel python dsl coverage: parser_only observation: not_observed evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python dsl excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is inspectable_source.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Source code identifies a possible software-to-kernel path. It does not determine executed kernel identity, bytes moved, link traffic, power, heat, cooling energy, water consumption, or cost without joined runtime and facility receipts.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

helion-matmul Helion tiled matmul 27 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Helion tiled matmul

python dsl

REGISTERED SOURCE · 27 DISPLAYED LINES

examples/hbm-learning-journey/extensions/code-planes/helion_matmul.py

     E01  #!/usr/bin/env python3
     E02  """Helion v1.0 tiled matmul boundary from the official project example."""
     E03
     E04  import helion
     E05  import helion.language as hl
     E06  import torch
     E07
     E08
     E09  @helion.kernel()
     E10  def matmul(x: torch.Tensor, y: torch.Tensor) -> torch.Tensor:
     E11      m, k = x.size()
     E12      _k, n = y.size()
     E13      output = torch.empty([m, n], dtype=x.dtype, device=x.device)
     E14      for tile_m, tile_n in hl.tile([m, n]):
     E15          accumulator = hl.zeros([tile_m, tile_n], dtype=torch.float32)
     E16          for tile_k in hl.tile(k):
     E17              accumulator = torch.addmm(
     E18                  accumulator, x[tile_m, tile_k], y[tile_k, tile_n]
     E19              )
     E20          output[tile_m, tile_n] = accumulator
     E21      return output
     E22
     E23
     E24  if __name__ == "__main__":
     E25      raise SystemExit("parser_only: GPU execution and reference comparison not captured")
     E26
     E27  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 27 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """Helion v1.0 tiled matmul boundary from the official project example."""

This documentation line explains `Helion v1.0 tiled matmul boundary from the official project example.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 import helion

This line imports `import helion` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import helion` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 import helion.language as hl

This line imports `import helion.language as hl` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import helion.language as hl` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 import torch

This line imports `import torch` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import torch` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 @helion.kernel()

This line attaches `helion.kernel` metadata or compilation behavior to the definition that follows. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `helion.kernel` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 def matmul(x: torch.Tensor, y: torch.Tensor) -> torch.Tensor:

This line begins the `matmul` callable contract used by Helion tiled matmul; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `matmul` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 m, k = x.size()

This line calls `x.size(...)` and binds its returned value to `k` for later use in Helion tiled matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `k ← x.size(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 _k, n = y.size()

This line calls `y.size(...)` and binds its returned value to `n` for later use in Helion tiled matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `n ← y.size(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 output = torch.empty([m, n], dtype=x.dtype, device=x.device)

This line calls `torch.empty(...)` and binds its returned value to `output` for later use in Helion tiled matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `output ← torch.empty(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 for tile_m, tile_n in hl.tile([m, n]):

This line begins the repeated control path `for tile_m, tile_n in hl.tile([m, n]):` inside Helion tiled matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `for tile_m, tile_n in hl.tile([m, n]):` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 accumulator = hl.zeros([tile_m, tile_n], dtype=torch.float32)

This line calls `hl.zeros(...)` and binds its returned value to `accumulator` for later use in Helion tiled matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `accumulator ← hl.zeros(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 for tile_k in hl.tile(k):

This line begins the repeated control path `for tile_k in hl.tile(k):` inside Helion tiled matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `for tile_k in hl.tile(k):` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 accumulator = torch.addmm(

This line calls `torch.addmm(...)` and binds its returned value to `accumulator` for later use in Helion tiled matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `accumulator ← torch.addmm(...)` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 accumulator, x[tile_m, tile_k], y[tile_k, tile_n]

This exact expression `accumulator, x[tile_m, tile_k], y[tile_k, tile_n]` contributes to the surrounding Helion tiled matmul statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `accumulator, x[tile_m, tile_k], y[tile_k, tile_n]` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 output[tile_m, tile_n] = accumulator

This line binds or updates `tile_n] = accumulator` for later source in Helion tiled matmul. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `tile_n] = accumulator` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 return output

This line returns `return output` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `return output` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if __name__ == "__main__":` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 raise SystemExit("parser_only: GPU execution and reference comparison not captured")

This line enforces `raise SystemExit("parser_only: GPU execution and reference comparison not captured")` and stops or rejects the path when the condition fails. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `raise SystemExit("parser_only: GPU execution and reference comparison not captured")` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 27 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · PyTorch Foundation

Source path: examples/hbm-learning-journey/extensions/code-planes/helion_matmul.py

Revision: not supplied

shared kernel python dsl coverage: parser_only observation: not_observed evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python dsl excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is inspectable_source.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Source code identifies a possible software-to-kernel path. It does not determine executed kernel identity, bytes moved, link traffic, power, heat, cooling energy, water consumption, or cost without joined runtime and facility receipts.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

pytorch-eager PyTorch eager and ATen 67 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

PyTorch eager and ATen

python

REGISTERED SOURCE · 67 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/01-framework/pytorch_paths.py

     E01  #!/usr/bin/env python3
     E02  """Compare eager and torch.compile without claiming a GLM-5.2 receipt."""
     E03
     E04  from __future__ import annotations
     E05
     E06  import json
     E07  import time
     E08
     E09  import torch
     E10
     E11
     E12  class TinyMoE(torch.nn.Module):
     E13      def __init__(self, hidden: int = 256, experts: int = 4) -> None:
     E14          super().__init__()
     E15          self.router = torch.nn.Linear(hidden, experts, bias=False)
     E16          self.experts = torch.nn.ModuleList(
     E17              [torch.nn.Linear(hidden, hidden, bias=False) for _ in range(experts)]
     E18          )
     E19
     E20      def forward(self, x: torch.Tensor) -> torch.Tensor:
     E21          # The discrete route intentionally creates a graph-break risk. The
     E22          # compile explanation should show that a graph break is evidence, not a
     E23          # silent compiler failure.
     E24          route = int(self.router(x).mean(dim=0).argmax().item())
     E25          return self.experts[route](x)
     E26
     E27
     E28  def timed(fn, x: torch.Tensor) -> tuple[torch.Tensor, float]:
     E29      if x.is_cuda:
     E30          torch.cuda.synchronize()
     E31      start = time.perf_counter()
     E32      y = fn(x)
     E33      if x.is_cuda:
     E34          torch.cuda.synchronize()
     E35      return y, (time.perf_counter() - start) * 1_000
     E36
     E37
     E38  def main() -> None:
     E39      device = "cuda" if torch.cuda.is_available() else "cpu"
     E40      model = TinyMoE().to(device).eval()
     E41      x = torch.randn(32, 256, device=device)
     E42      eager, eager_ms = timed(model, x)
     E43
     E44      compiled_model = torch.compile(model, backend="inductor")
     E45      compiled, compile_and_first_ms = timed(compiled_model, x)
     E46      compiled_steady, steady_ms = timed(compiled_model, x)
     E47
     E48      print(
     E49          json.dumps(
     E50              {
     E51                  "device": device,
     E52                  "torch": torch.__version__,
     E53                  "eager_ms": eager_ms,
     E54                  "compile_and_first_ms": compile_and_first_ms,
     E55                  "compiled_steady_ms": steady_ms,
     E56                  "max_abs_error": float((eager - compiled).abs().max()),
     E57                  "steady_matches_first": bool(torch.allclose(compiled, compiled_steady)),
     E58                  "receipt_scope": "toy_operator_path_not_glm_5_2",
     E59              },
     E60              indent=2,
     E61          )
     E62      )
     E63
     E64
     E65  if __name__ == "__main__":
     E66      main()
     E67  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 67 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """Compare eager and torch.compile without claiming a GLM-5.2 receipt."""

This documentation line explains `Compare eager and torch.compile without claiming a GLM-5.2 receipt.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 from __future__ import annotations

This line imports `from __future__ import annotations` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `from __future__ import annotations` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 import json

This line imports `import json` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import json` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 import time

This line imports `import time` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import time` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 import torch

This line imports `import torch` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import torch` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 class TinyMoE(torch.nn.Module):

This line begins the `TinyMoE` type used by PyTorch eager and ATen; its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `TinyMoE` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 def __init__(self, hidden: int = 256, experts: int = 4) -> None:

This line begins the `__init__` callable contract used by PyTorch eager and ATen; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `__init__` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 super().__init__()

This line invokes the call chain `super → __init__` when PyTorch eager and ATen executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `super → __init__` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 self.router = torch.nn.Linear(hidden, experts, bias=False)

This line calls `torch.nn.Linear(...)` and binds its returned value to `self.router` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `self.router ← torch.nn.Linear(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 self.experts = torch.nn.ModuleList(

This line calls `torch.nn.ModuleList(...)` and binds its returned value to `self.experts` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `self.experts ← torch.nn.ModuleList(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 [torch.nn.Linear(hidden, hidden, bias=False) for _ in range(experts)]

This line calls `range(...)` and binds its returned value to `bias` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `bias ← range(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 def forward(self, x: torch.Tensor) -> torch.Tensor:

This line begins the `forward` callable contract used by PyTorch eager and ATen; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `forward` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 # The discrete route intentionally creates a graph-break risk. The

This comment documents `The discrete route intentionally creates a graph-break risk. The` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 # compile explanation should show that a graph break is evidence, not a

This comment documents `compile explanation should show that a graph break is evidence, not a` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 # silent compiler failure.

This comment documents `silent compiler failure.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 route = int(self.router(x).mean(dim=0).argmax().item())

This line calls `int(...)` and binds its returned value to `route` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `route ← int(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 return self.experts[route](x)

This line returns `return self.experts[route](x)` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `return self.experts[route](x)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 def timed(fn, x: torch.Tensor) -> tuple[torch.Tensor, float]:

This line begins the `timed` callable contract used by PyTorch eager and ATen; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `timed` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 if x.is_cuda:

This line selects a control path using `if x.is_cuda:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if x.is_cuda:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 torch.cuda.synchronize()

This line invokes the call chain `torch.cuda.synchronize` when PyTorch eager and ATen executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `torch.cuda.synchronize` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 start = time.perf_counter()

This line calls `time.perf_counter(...)` and binds its returned value to `start` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `start ← time.perf_counter(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 y = fn(x)

This line calls `fn(...)` and binds its returned value to `y` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `y ← fn(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 if x.is_cuda:

This line selects a control path using `if x.is_cuda:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if x.is_cuda:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 torch.cuda.synchronize()

This line invokes the call chain `torch.cuda.synchronize` when PyTorch eager and ATen executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `torch.cuda.synchronize` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 return y, (time.perf_counter() - start) * 1_000

This line returns `return y, (time.perf_counter() - start) * 1_000` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `return y, (time.perf_counter() - start) * 1_000` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 def main() -> None:

This line begins the `main` callable contract used by PyTorch eager and ATen; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `main` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 device = "cuda" if torch.cuda.is_available() else "cpu"

This line calls `torch.cuda.is_available(...)` and binds its returned value to `device` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `device ← torch.cuda.is_available(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 model = TinyMoE().to(device).eval()

This line calls `TinyMoE(...)` and binds its returned value to `model` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `model ← TinyMoE(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 x = torch.randn(32, 256, device=device)

This line calls `torch.randn(...)` and binds its returned value to `x` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `x ← torch.randn(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 eager, eager_ms = timed(model, x)

This line calls `timed(...)` and binds its returned value to `eager_ms` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `eager_ms ← timed(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 compiled_model = torch.compile(model, backend="inductor")

This line calls `torch.compile(...)` and binds its returned value to `compiled_model` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `compiled_model ← torch.compile(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 compiled, compile_and_first_ms = timed(compiled_model, x)

This line calls `timed(...)` and binds its returned value to `compile_and_first_ms` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `compile_and_first_ms ← timed(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 compiled_steady, steady_ms = timed(compiled_model, x)

This line calls `timed(...)` and binds its returned value to `steady_ms` for later use in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `steady_ms ← timed(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 print(

This line invokes the call chain `print` when PyTorch eager and ATen executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `print` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 json.dumps(

This line invokes the call chain `json.dumps` when PyTorch eager and ATen executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `json.dumps` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 {

This exact expression `{` contributes to the surrounding PyTorch eager and ATen statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `{` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 "device": device,

This line declares `device = device` as an exact configuration value used by PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `device = device` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 "torch": torch.__version__,

This line declares `torch = torch.__version__` as an exact configuration value used by PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `torch = torch.__version__` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 "eager_ms": eager_ms,

This line declares `eager_ms = eager_ms` as an exact configuration value used by PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `eager_ms = eager_ms` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 "compile_and_first_ms": compile_and_first_ms,

This line declares `compile_and_first_ms = compile_and_first_ms` as an exact configuration value used by PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `compile_and_first_ms = compile_and_first_ms` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 "compiled_steady_ms": steady_ms,

This line declares `compiled_steady_ms = steady_ms` as an exact configuration value used by PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `compiled_steady_ms = steady_ms` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 "max_abs_error": float((eager - compiled).abs().max()),

This line declares `max_abs_error = float((eager - compiled).abs().max())` as an exact configuration value used by PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `max_abs_error = float((eager - compiled).abs().max())` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 "steady_matches_first": bool(torch.allclose(compiled, compiled_steady)),

This line declares `steady_matches_first = bool(torch.allclose(compiled, compiled_steady))` as an exact configuration value used by PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `steady_matches_first = bool(torch.allclose(compiled, compiled_steady))` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 "receipt_scope": "toy_operator_path_not_glm_5_2",

This line declares `receipt_scope = "toy_operator_path_not_glm_5_2"` as an exact configuration value used by PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `receipt_scope = "toy_operator_path_not_glm_5_2"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 },

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 indent=2,

This line binds or updates `indent = 2,` for later source in PyTorch eager and ATen. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `indent = 2,` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E61 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E62 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E63 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E64 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E65 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if __name__ == "__main__":` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E66 main()

This line invokes the call chain `main` when PyTorch eager and ATen executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `main` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E67 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 67 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · PyTorch Foundation

Source path: examples/hbm-learning-journey/nvidia/01-framework/pytorch_paths.py

Revision: not supplied

shared engine python coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is model_framework.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

torch-compile-inductor torch.compile and TorchInductor 67 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

torch.compile and TorchInductor

python

REGISTERED SOURCE · 67 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/01-framework/pytorch_paths.py

     E01  #!/usr/bin/env python3
     E02  """Compare eager and torch.compile without claiming a GLM-5.2 receipt."""
     E03
     E04  from __future__ import annotations
     E05
     E06  import json
     E07  import time
     E08
     E09  import torch
     E10
     E11
     E12  class TinyMoE(torch.nn.Module):
     E13      def __init__(self, hidden: int = 256, experts: int = 4) -> None:
     E14          super().__init__()
     E15          self.router = torch.nn.Linear(hidden, experts, bias=False)
     E16          self.experts = torch.nn.ModuleList(
     E17              [torch.nn.Linear(hidden, hidden, bias=False) for _ in range(experts)]
     E18          )
     E19
     E20      def forward(self, x: torch.Tensor) -> torch.Tensor:
     E21          # The discrete route intentionally creates a graph-break risk. The
     E22          # compile explanation should show that a graph break is evidence, not a
     E23          # silent compiler failure.
     E24          route = int(self.router(x).mean(dim=0).argmax().item())
     E25          return self.experts[route](x)
     E26
     E27
     E28  def timed(fn, x: torch.Tensor) -> tuple[torch.Tensor, float]:
     E29      if x.is_cuda:
     E30          torch.cuda.synchronize()
     E31      start = time.perf_counter()
     E32      y = fn(x)
     E33      if x.is_cuda:
     E34          torch.cuda.synchronize()
     E35      return y, (time.perf_counter() - start) * 1_000
     E36
     E37
     E38  def main() -> None:
     E39      device = "cuda" if torch.cuda.is_available() else "cpu"
     E40      model = TinyMoE().to(device).eval()
     E41      x = torch.randn(32, 256, device=device)
     E42      eager, eager_ms = timed(model, x)
     E43
     E44      compiled_model = torch.compile(model, backend="inductor")
     E45      compiled, compile_and_first_ms = timed(compiled_model, x)
     E46      compiled_steady, steady_ms = timed(compiled_model, x)
     E47
     E48      print(
     E49          json.dumps(
     E50              {
     E51                  "device": device,
     E52                  "torch": torch.__version__,
     E53                  "eager_ms": eager_ms,
     E54                  "compile_and_first_ms": compile_and_first_ms,
     E55                  "compiled_steady_ms": steady_ms,
     E56                  "max_abs_error": float((eager - compiled).abs().max()),
     E57                  "steady_matches_first": bool(torch.allclose(compiled, compiled_steady)),
     E58                  "receipt_scope": "toy_operator_path_not_glm_5_2",
     E59              },
     E60              indent=2,
     E61          )
     E62      )
     E63
     E64
     E65  if __name__ == "__main__":
     E66      main()
     E67  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 67 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """Compare eager and torch.compile without claiming a GLM-5.2 receipt."""

This documentation line explains `Compare eager and torch.compile without claiming a GLM-5.2 receipt.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 from __future__ import annotations

This line imports `from __future__ import annotations` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `from __future__ import annotations` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 import json

This line imports `import json` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import json` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 import time

This line imports `import time` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import time` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 import torch

This line imports `import torch` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import torch` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 class TinyMoE(torch.nn.Module):

This line begins the `TinyMoE` type used by torch.compile and TorchInductor; its body defines structure and behavior. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `TinyMoE` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 def __init__(self, hidden: int = 256, experts: int = 4) -> None:

This line begins the `__init__` callable contract used by torch.compile and TorchInductor; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `__init__` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 super().__init__()

This line invokes the call chain `super → __init__` when torch.compile and TorchInductor executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `super → __init__` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 self.router = torch.nn.Linear(hidden, experts, bias=False)

This line calls `torch.nn.Linear(...)` and binds its returned value to `self.router` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `self.router ← torch.nn.Linear(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 self.experts = torch.nn.ModuleList(

This line calls `torch.nn.ModuleList(...)` and binds its returned value to `self.experts` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `self.experts ← torch.nn.ModuleList(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 [torch.nn.Linear(hidden, hidden, bias=False) for _ in range(experts)]

This line calls `range(...)` and binds its returned value to `bias` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `bias ← range(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 def forward(self, x: torch.Tensor) -> torch.Tensor:

This line begins the `forward` callable contract used by torch.compile and TorchInductor; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `forward` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 # The discrete route intentionally creates a graph-break risk. The

This comment documents `The discrete route intentionally creates a graph-break risk. The` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 # compile explanation should show that a graph break is evidence, not a

This comment documents `compile explanation should show that a graph break is evidence, not a` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 # silent compiler failure.

This comment documents `silent compiler failure.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 route = int(self.router(x).mean(dim=0).argmax().item())

This line calls `int(...)` and binds its returned value to `route` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `route ← int(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 return self.experts[route](x)

This line returns `return self.experts[route](x)` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `return self.experts[route](x)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 def timed(fn, x: torch.Tensor) -> tuple[torch.Tensor, float]:

This line begins the `timed` callable contract used by torch.compile and TorchInductor; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `timed` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 if x.is_cuda:

This line selects a control path using `if x.is_cuda:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if x.is_cuda:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 torch.cuda.synchronize()

This line invokes the call chain `torch.cuda.synchronize` when torch.compile and TorchInductor executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `torch.cuda.synchronize` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 start = time.perf_counter()

This line calls `time.perf_counter(...)` and binds its returned value to `start` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `start ← time.perf_counter(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 y = fn(x)

This line calls `fn(...)` and binds its returned value to `y` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `y ← fn(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 if x.is_cuda:

This line selects a control path using `if x.is_cuda:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if x.is_cuda:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 torch.cuda.synchronize()

This line invokes the call chain `torch.cuda.synchronize` when torch.compile and TorchInductor executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `torch.cuda.synchronize` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 return y, (time.perf_counter() - start) * 1_000

This line returns `return y, (time.perf_counter() - start) * 1_000` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `return y, (time.perf_counter() - start) * 1_000` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 def main() -> None:

This line begins the `main` callable contract used by torch.compile and TorchInductor; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `main` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 device = "cuda" if torch.cuda.is_available() else "cpu"

This line calls `torch.cuda.is_available(...)` and binds its returned value to `device` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `device ← torch.cuda.is_available(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 model = TinyMoE().to(device).eval()

This line calls `TinyMoE(...)` and binds its returned value to `model` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `model ← TinyMoE(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
Routed-expert work can change weight reuse, token exchange, and HBM demand; selected experts, bytes, and residency require the actual request trace.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 x = torch.randn(32, 256, device=device)

This line calls `torch.randn(...)` and binds its returned value to `x` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `x ← torch.randn(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 eager, eager_ms = timed(model, x)

This line calls `timed(...)` and binds its returned value to `eager_ms` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `eager_ms ← timed(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 compiled_model = torch.compile(model, backend="inductor")

This line calls `torch.compile(...)` and binds its returned value to `compiled_model` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `compiled_model ← torch.compile(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 compiled, compile_and_first_ms = timed(compiled_model, x)

This line calls `timed(...)` and binds its returned value to `compile_and_first_ms` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `compile_and_first_ms ← timed(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 compiled_steady, steady_ms = timed(compiled_model, x)

This line calls `timed(...)` and binds its returned value to `steady_ms` for later use in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `steady_ms ← timed(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 print(

This line invokes the call chain `print` when torch.compile and TorchInductor executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `print` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 json.dumps(

This line invokes the call chain `json.dumps` when torch.compile and TorchInductor executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `json.dumps` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 {

This exact expression `{` contributes to the surrounding torch.compile and TorchInductor statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `{` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 "device": device,

This line declares `device = device` as an exact configuration value used by torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `device = device` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 "torch": torch.__version__,

This line declares `torch = torch.__version__` as an exact configuration value used by torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `torch = torch.__version__` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 "eager_ms": eager_ms,

This line declares `eager_ms = eager_ms` as an exact configuration value used by torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `eager_ms = eager_ms` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 "compile_and_first_ms": compile_and_first_ms,

This line declares `compile_and_first_ms = compile_and_first_ms` as an exact configuration value used by torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `compile_and_first_ms = compile_and_first_ms` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 "compiled_steady_ms": steady_ms,

This line declares `compiled_steady_ms = steady_ms` as an exact configuration value used by torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `compiled_steady_ms = steady_ms` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 "max_abs_error": float((eager - compiled).abs().max()),

This line declares `max_abs_error = float((eager - compiled).abs().max())` as an exact configuration value used by torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `max_abs_error = float((eager - compiled).abs().max())` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 "steady_matches_first": bool(torch.allclose(compiled, compiled_steady)),

This line declares `steady_matches_first = bool(torch.allclose(compiled, compiled_steady))` as an exact configuration value used by torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `steady_matches_first = bool(torch.allclose(compiled, compiled_steady))` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 "receipt_scope": "toy_operator_path_not_glm_5_2",

This line declares `receipt_scope = "toy_operator_path_not_glm_5_2"` as an exact configuration value used by torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `receipt_scope = "toy_operator_path_not_glm_5_2"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 },

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 indent=2,

This line binds or updates `indent = 2,` for later source in torch.compile and TorchInductor. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `indent = 2,` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E61 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E62 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E63 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E64 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E65 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if __name__ == "__main__":` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E66 main()

This line invokes the call chain `main` when torch.compile and TorchInductor executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `main` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E67 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 67 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · PyTorch Foundation

Source path: examples/hbm-learning-journey/nvidia/01-framework/pytorch_paths.py

Revision: not supplied

shared engine python coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is compiler.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

vllm vLLM 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

vLLM

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # These are capability/configuration probes. They do not download weights and
     E05  # do not claim that GLM-5.2 is supported until the exact revision starts and
     E06  # completes the accepted-patch replay.
     E07
     E08  probe_module() {
     E09    local module="$1"
     E10    python3 - "$module" <<'PY'
     E11  import importlib.util
     E12  import sys
     E13
     E14  module = sys.argv[1]
     E15  print(f"{module}: {'installed' if importlib.util.find_spec(module) else 'missing'}")
     E16  PY
     E17  }
     E18
     E19  probe_module vllm
     E20  probe_module sglang
     E21  probe_module lmcache
     E22  probe_module tensorrt_llm
     E23  probe_module dynamo
     E24
     E25  command -v vllm >/dev/null && vllm --help | sed -n '1,35p' || true
     E26  command -v sglang >/dev/null && sglang --help | sed -n '1,35p' || true
     E27  command -v trtllm-serve >/dev/null && trtllm-serve --help | sed -n '1,35p' || true
     E28
     E29  cat <<'NOTE'
     E30  Reference launch surfaces only:
     E31    vLLM:            vllm serve <exact-model-revision> --enable-prefix-caching
     E32    SGLang/HiCache:  python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache
     E33    LMCache:         configure a named vLLM/SGLang connector version and prove lookup/store events
     E34    TensorRT-LLM:    trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `/usr/bin/env bash` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # These are capability/configuration probes. They do not download weights and

This comment documents `These are capability/configuration probes. They do not download weights and` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # do not claim that GLM-5.2 is supported until the exact revision starts and

This comment documents `do not claim that GLM-5.2 is supported until the exact revision starts and` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 # completes the accepted-patch replay.

This comment documents `completes the accepted-patch replay.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 probe_module() {

This line invokes `probe_module()` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 local module="$1"

This line binds or updates `module = "$1"` for later source in vLLM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `module = "$1"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 python3 - "$module" <<'PY'

This line invokes `python3` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 import importlib.util

This line imports `import importlib.util` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import importlib.util` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 import sys

This line imports `import sys` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import sys` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 module = sys.argv[1]

This line binds or updates `module = sys.argv[1]` for later source in vLLM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `module = sys.argv[1]` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 print(f"{module}: {'installed' if importlib.util.find_spec(module) else 'missing'}")

This line invokes `print(f"{module}:` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{module}:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 PY

This line invokes `PY` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_module vllm

This line invokes `probe_module` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_module sglang

This line invokes `probe_module` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_module lmcache

This line invokes `probe_module` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_module tensorrt_llm

This line invokes `probe_module` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_module dynamo

This line invokes `probe_module` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 command -v vllm >/dev/null && vllm --help | sed -n '1,35p' || true

This line invokes `command` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 command -v sglang >/dev/null && sglang --help | sed -n '1,35p' || true

This line invokes `command` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 command -v trtllm-serve >/dev/null && trtllm-serve --help | sed -n '1,35p' || true

This line invokes `command` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 cat <<'NOTE'

This line invokes `cat` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Reference launch surfaces only:

This line invokes `Reference` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Reference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 vLLM: vllm serve <exact-model-revision> --enable-prefix-caching

This line invokes `vLLM:` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `vLLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 SGLang/HiCache: python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache

This line invokes `SGLang/HiCache:` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `SGLang/HiCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 LMCache: configure a named vLLM/SGLang connector version and prove lookup/store events

This line invokes `LMCache:` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `LMCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 TensorRT-LLM: trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported

This line invokes `TensorRT-LLM:` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `TensorRT-LLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the vLLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · vLLM Project

Source path: examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

Revision: not supplied

shared engine bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is inference_engine.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

sglang SGLang 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

SGLang

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # These are capability/configuration probes. They do not download weights and
     E05  # do not claim that GLM-5.2 is supported until the exact revision starts and
     E06  # completes the accepted-patch replay.
     E07
     E08  probe_module() {
     E09    local module="$1"
     E10    python3 - "$module" <<'PY'
     E11  import importlib.util
     E12  import sys
     E13
     E14  module = sys.argv[1]
     E15  print(f"{module}: {'installed' if importlib.util.find_spec(module) else 'missing'}")
     E16  PY
     E17  }
     E18
     E19  probe_module vllm
     E20  probe_module sglang
     E21  probe_module lmcache
     E22  probe_module tensorrt_llm
     E23  probe_module dynamo
     E24
     E25  command -v vllm >/dev/null && vllm --help | sed -n '1,35p' || true
     E26  command -v sglang >/dev/null && sglang --help | sed -n '1,35p' || true
     E27  command -v trtllm-serve >/dev/null && trtllm-serve --help | sed -n '1,35p' || true
     E28
     E29  cat <<'NOTE'
     E30  Reference launch surfaces only:
     E31    vLLM:            vllm serve <exact-model-revision> --enable-prefix-caching
     E32    SGLang/HiCache:  python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache
     E33    LMCache:         configure a named vLLM/SGLang connector version and prove lookup/store events
     E34    TensorRT-LLM:    trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `/usr/bin/env bash` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # These are capability/configuration probes. They do not download weights and

This comment documents `These are capability/configuration probes. They do not download weights and` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # do not claim that GLM-5.2 is supported until the exact revision starts and

This comment documents `do not claim that GLM-5.2 is supported until the exact revision starts and` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 # completes the accepted-patch replay.

This comment documents `completes the accepted-patch replay.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 probe_module() {

This line invokes `probe_module()` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 local module="$1"

This line binds or updates `module = "$1"` for later source in SGLang. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `module = "$1"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 python3 - "$module" <<'PY'

This line invokes `python3` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 import importlib.util

This line imports `import importlib.util` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import importlib.util` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 import sys

This line imports `import sys` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import sys` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 module = sys.argv[1]

This line binds or updates `module = sys.argv[1]` for later source in SGLang. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `module = sys.argv[1]` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 print(f"{module}: {'installed' if importlib.util.find_spec(module) else 'missing'}")

This line invokes `print(f"{module}:` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{module}:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 PY

This line invokes `PY` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_module vllm

This line invokes `probe_module` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_module sglang

This line invokes `probe_module` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_module lmcache

This line invokes `probe_module` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_module tensorrt_llm

This line invokes `probe_module` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_module dynamo

This line invokes `probe_module` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 command -v vllm >/dev/null && vllm --help | sed -n '1,35p' || true

This line invokes `command` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 command -v sglang >/dev/null && sglang --help | sed -n '1,35p' || true

This line invokes `command` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 command -v trtllm-serve >/dev/null && trtllm-serve --help | sed -n '1,35p' || true

This line invokes `command` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 cat <<'NOTE'

This line invokes `cat` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Reference launch surfaces only:

This line invokes `Reference` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Reference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 vLLM: vllm serve <exact-model-revision> --enable-prefix-caching

This line invokes `vLLM:` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `vLLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 SGLang/HiCache: python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache

This line invokes `SGLang/HiCache:` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `SGLang/HiCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 LMCache: configure a named vLLM/SGLang connector version and prove lookup/store events

This line invokes `LMCache:` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `LMCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 TensorRT-LLM: trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported

This line invokes `TensorRT-LLM:` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `TensorRT-LLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the SGLang source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · SGLang Project

Source path: examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

Revision: not supplied

shared engine bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is inference_engine.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

lmcache LMCache 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

LMCache

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # These are capability/configuration probes. They do not download weights and
     E05  # do not claim that GLM-5.2 is supported until the exact revision starts and
     E06  # completes the accepted-patch replay.
     E07
     E08  probe_module() {
     E09    local module="$1"
     E10    python3 - "$module" <<'PY'
     E11  import importlib.util
     E12  import sys
     E13
     E14  module = sys.argv[1]
     E15  print(f"{module}: {'installed' if importlib.util.find_spec(module) else 'missing'}")
     E16  PY
     E17  }
     E18
     E19  probe_module vllm
     E20  probe_module sglang
     E21  probe_module lmcache
     E22  probe_module tensorrt_llm
     E23  probe_module dynamo
     E24
     E25  command -v vllm >/dev/null && vllm --help | sed -n '1,35p' || true
     E26  command -v sglang >/dev/null && sglang --help | sed -n '1,35p' || true
     E27  command -v trtllm-serve >/dev/null && trtllm-serve --help | sed -n '1,35p' || true
     E28
     E29  cat <<'NOTE'
     E30  Reference launch surfaces only:
     E31    vLLM:            vllm serve <exact-model-revision> --enable-prefix-caching
     E32    SGLang/HiCache:  python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache
     E33    LMCache:         configure a named vLLM/SGLang connector version and prove lookup/store events
     E34    TensorRT-LLM:    trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `/usr/bin/env bash` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # These are capability/configuration probes. They do not download weights and

This comment documents `These are capability/configuration probes. They do not download weights and` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # do not claim that GLM-5.2 is supported until the exact revision starts and

This comment documents `do not claim that GLM-5.2 is supported until the exact revision starts and` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 # completes the accepted-patch replay.

This comment documents `completes the accepted-patch replay.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 probe_module() {

This line invokes `probe_module()` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 local module="$1"

This line binds or updates `module = "$1"` for later source in LMCache. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `module = "$1"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 python3 - "$module" <<'PY'

This line invokes `python3` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 import importlib.util

This line imports `import importlib.util` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import importlib.util` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 import sys

This line imports `import sys` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import sys` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 module = sys.argv[1]

This line binds or updates `module = sys.argv[1]` for later source in LMCache. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `module = sys.argv[1]` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 print(f"{module}: {'installed' if importlib.util.find_spec(module) else 'missing'}")

This line invokes `print(f"{module}:` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{module}:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 PY

This line invokes `PY` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_module vllm

This line invokes `probe_module` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_module sglang

This line invokes `probe_module` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_module lmcache

This line invokes `probe_module` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_module tensorrt_llm

This line invokes `probe_module` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_module dynamo

This line invokes `probe_module` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 command -v vllm >/dev/null && vllm --help | sed -n '1,35p' || true

This line invokes `command` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 command -v sglang >/dev/null && sglang --help | sed -n '1,35p' || true

This line invokes `command` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 command -v trtllm-serve >/dev/null && trtllm-serve --help | sed -n '1,35p' || true

This line invokes `command` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 cat <<'NOTE'

This line invokes `cat` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Reference launch surfaces only:

This line invokes `Reference` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Reference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 vLLM: vllm serve <exact-model-revision> --enable-prefix-caching

This line invokes `vLLM:` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `vLLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 SGLang/HiCache: python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache

This line invokes `SGLang/HiCache:` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `SGLang/HiCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 LMCache: configure a named vLLM/SGLang connector version and prove lookup/store events

This line invokes `LMCache:` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `LMCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 TensorRT-LLM: trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported

This line invokes `TensorRT-LLM:` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `TensorRT-LLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the LMCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · LMCache Project

Source path: examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

Revision: not supplied

shared engine bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is kv_cache.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

hicache SGLang HiCache 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

SGLang HiCache

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # These are capability/configuration probes. They do not download weights and
     E05  # do not claim that GLM-5.2 is supported until the exact revision starts and
     E06  # completes the accepted-patch replay.
     E07
     E08  probe_module() {
     E09    local module="$1"
     E10    python3 - "$module" <<'PY'
     E11  import importlib.util
     E12  import sys
     E13
     E14  module = sys.argv[1]
     E15  print(f"{module}: {'installed' if importlib.util.find_spec(module) else 'missing'}")
     E16  PY
     E17  }
     E18
     E19  probe_module vllm
     E20  probe_module sglang
     E21  probe_module lmcache
     E22  probe_module tensorrt_llm
     E23  probe_module dynamo
     E24
     E25  command -v vllm >/dev/null && vllm --help | sed -n '1,35p' || true
     E26  command -v sglang >/dev/null && sglang --help | sed -n '1,35p' || true
     E27  command -v trtllm-serve >/dev/null && trtllm-serve --help | sed -n '1,35p' || true
     E28
     E29  cat <<'NOTE'
     E30  Reference launch surfaces only:
     E31    vLLM:            vllm serve <exact-model-revision> --enable-prefix-caching
     E32    SGLang/HiCache:  python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache
     E33    LMCache:         configure a named vLLM/SGLang connector version and prove lookup/store events
     E34    TensorRT-LLM:    trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `/usr/bin/env bash` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # These are capability/configuration probes. They do not download weights and

This comment documents `These are capability/configuration probes. They do not download weights and` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # do not claim that GLM-5.2 is supported until the exact revision starts and

This comment documents `do not claim that GLM-5.2 is supported until the exact revision starts and` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 # completes the accepted-patch replay.

This comment documents `completes the accepted-patch replay.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 probe_module() {

This line invokes `probe_module()` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 local module="$1"

This line binds or updates `module = "$1"` for later source in SGLang HiCache. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `module = "$1"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 python3 - "$module" <<'PY'

This line invokes `python3` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 import importlib.util

This line imports `import importlib.util` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import importlib.util` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 import sys

This line imports `import sys` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import sys` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 module = sys.argv[1]

This line binds or updates `module = sys.argv[1]` for later source in SGLang HiCache. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `module = sys.argv[1]` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 print(f"{module}: {'installed' if importlib.util.find_spec(module) else 'missing'}")

This line invokes `print(f"{module}:` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{module}:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 PY

This line invokes `PY` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_module vllm

This line invokes `probe_module` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_module sglang

This line invokes `probe_module` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_module lmcache

This line invokes `probe_module` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_module tensorrt_llm

This line invokes `probe_module` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_module dynamo

This line invokes `probe_module` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 command -v vllm >/dev/null && vllm --help | sed -n '1,35p' || true

This line invokes `command` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 command -v sglang >/dev/null && sglang --help | sed -n '1,35p' || true

This line invokes `command` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 command -v trtllm-serve >/dev/null && trtllm-serve --help | sed -n '1,35p' || true

This line invokes `command` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 cat <<'NOTE'

This line invokes `cat` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Reference launch surfaces only:

This line invokes `Reference` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Reference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 vLLM: vllm serve <exact-model-revision> --enable-prefix-caching

This line invokes `vLLM:` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `vLLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 SGLang/HiCache: python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache

This line invokes `SGLang/HiCache:` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `SGLang/HiCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 LMCache: configure a named vLLM/SGLang connector version and prove lookup/store events

This line invokes `LMCache:` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `LMCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 TensorRT-LLM: trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported

This line invokes `TensorRT-LLM:` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `TensorRT-LLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the SGLang HiCache source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · SGLang Project

Source path: examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

Revision: not supplied

shared engine bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is kv_cache.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cuda-toolkit CUDA Toolkit 38 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUDA Toolkit

bash

REGISTERED SOURCE · 38 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/00-environment/detect.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # Read-only environment receipt. This script never selects an architecture by
     E05  # product nickname; it asks the installed driver and toolkit.
     E06
     E07  command -v nvidia-smi >/dev/null && nvidia-smi --query-gpu=index,name,uuid,driver_version,compute_cap,pci.bus_id,memory.total --format=csv,noheader || true
     E08  command -v nvcc >/dev/null && nvcc --version || true
     E09  command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true
     E10  command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true
     E11  command -v dcgmi >/dev/null && dcgmi discovery -l || true
     E12
     E13  python3 - <<'PY'
     E14  import importlib.metadata as metadata
     E15  import json
     E16
     E17  packages = [
     E18      "torch",
     E19      "triton",
     E20      "flashinfer-python",
     E21      "transformer-engine",
     E22      "nvidia-modelopt",
     E23      "vllm",
     E24      "sglang",
     E25      "lmcache",
     E26      "tensorrt-llm",
     E27      "ai-dynamo",
     E28      "nixl",
     E29  ]
     E30  versions = {}
     E31  for package in packages:
     E32      try:
     E33          versions[package] = metadata.version(package)
     E34      except metadata.PackageNotFoundError:
     E35          versions[package] = None
     E36  print(json.dumps(versions, indent=2, sort_keys=True))
     E37  PY
     E38  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 38 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the CUDA Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Read-only environment receipt. This script never selects an architecture by

This comment documents `Read-only environment receipt. This script never selects an architecture by` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # product nickname; it asks the installed driver and toolkit.

This comment documents `product nickname; it asks the installed driver and toolkit.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 command -v nvidia-smi >/dev/null && nvidia-smi --query-gpu=index,name,uuid,driver_version,compute_cap,pci.bus_id,memory.total --format=csv,noheader || true

This line invokes `command` in the CUDA Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 command -v nvcc >/dev/null && nvcc --version || true

This line invokes `command` in the CUDA Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true

This line invokes `command` in the CUDA Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true

This line invokes `command` in the CUDA Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 command -v dcgmi >/dev/null && dcgmi discovery -l || true

This line invokes `command` in the CUDA Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 python3 - <<'PY'

This line invokes `python3` in the CUDA Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 import json

This line imports `import json` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import json` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 packages = [

This line binds or updates `packages = [` for later source in CUDA Toolkit. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = [` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 "torch",

This exact expression `"torch",` contributes to the surrounding CUDA Toolkit statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"torch",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 "triton",

This exact expression `"triton",` contributes to the surrounding CUDA Toolkit statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"triton",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 "flashinfer-python",

This exact expression `"flashinfer-python",` contributes to the surrounding CUDA Toolkit statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"flashinfer-python",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 "transformer-engine",

This exact expression `"transformer-engine",` contributes to the surrounding CUDA Toolkit statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"transformer-engine",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 "nvidia-modelopt",

This exact expression `"nvidia-modelopt",` contributes to the surrounding CUDA Toolkit statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"nvidia-modelopt",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 "vllm",

This exact expression `"vllm",` contributes to the surrounding CUDA Toolkit statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"vllm",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 "sglang",

This exact expression `"sglang",` contributes to the surrounding CUDA Toolkit statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"sglang",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 "lmcache",

This exact expression `"lmcache",` contributes to the surrounding CUDA Toolkit statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"lmcache",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 "tensorrt-llm",

This exact expression `"tensorrt-llm",` contributes to the surrounding CUDA Toolkit statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"tensorrt-llm",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 "ai-dynamo",

This exact expression `"ai-dynamo",` contributes to the surrounding CUDA Toolkit statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"ai-dynamo",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 "nixl",

This exact expression `"nixl",` contributes to the surrounding CUDA Toolkit statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"nixl",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 ]

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 versions = {}

This line binds or updates `versions = {}` for later source in CUDA Toolkit. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `versions = {}` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 for package in packages:

This line begins the repeated control path `for package in packages:` inside CUDA Toolkit. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for package in packages:` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 try:

This line invokes `try:` in the CUDA Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 versions[package] = metadata.version(package)

This line calls `metadata.version(...)` and binds its returned value to `versions[package]` for later use in CUDA Toolkit. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `versions[package] ← metadata.version(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 except metadata.PackageNotFoundError:

This line invokes `except` in the CUDA Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 versions[package] = None

This line binds or updates `versions[package] = None` for later source in CUDA Toolkit. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `versions[package] = None` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 print(json.dumps(versions, indent=2, sort_keys=True))

This line binds or updates `indent = 2, sort_keys=True))` for later source in CUDA Toolkit. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `indent = 2, sort_keys=True))` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 PY

This line invokes `PY` in the CUDA Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 38 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/00-environment/detect.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is toolchain.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cuda-runtime CUDA Runtime API 75 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUDA Runtime API

cuda

REGISTERED SOURCE · 75 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/02-runtime/cuda_path.cu

     E01  #include <cuda_runtime.h>
     E02
     E03  #include <cstdio>
     E04  #include <cstdlib>
     E05
     E06  #define CUDA_CHECK(call)                                                        \
     E07      do {                                                                        \
     E08          const cudaError_t status = (call);                                      \
     E09          if (status != cudaSuccess) {                                            \
     E10              std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \
     E11                           cudaGetErrorString(status));                           \
     E12              std::exit(EXIT_FAILURE);                                            \
     E13          }                                                                       \
     E14      } while (0)
     E15
     E16  __global__ void add_one(float* values, int n) {
     E17      const int i = blockIdx.x * blockDim.x + threadIdx.x;
     E18      if (i < n) {
     E19          values[i] += 1.0F;
     E20      }
     E21  }
     E22
     E23  int main() {
     E24      constexpr int n = 1 << 20;
     E25      constexpr size_t bytes = n * sizeof(float);
     E26
     E27      int device = 0;
     E28      cudaDeviceProp properties{};
     E29      CUDA_CHECK(cudaGetDevice(&device));
     E30      CUDA_CHECK(cudaGetDeviceProperties(&properties, device));
     E31
     E32      cudaStream_t stream{};
     E33      cudaEvent_t start{}, stop{};
     E34      CUDA_CHECK(cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking));
     E35      CUDA_CHECK(cudaEventCreate(&start));
     E36      CUDA_CHECK(cudaEventCreate(&stop));
     E37
     E38      // cudaMallocAsync uses the device's default stream-ordered memory pool.
     E39      float* values = nullptr;
     E40      CUDA_CHECK(cudaMallocAsync(&values, bytes, stream));
     E41      CUDA_CHECK(cudaMemsetAsync(values, 0, bytes, stream));
     E42
     E43      cudaGraph_t graph{};
     E44      cudaGraphExec_t executable{};
     E45      CUDA_CHECK(cudaStreamBeginCapture(stream, cudaStreamCaptureModeGlobal));
     E46      add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);
     E47      CUDA_CHECK(cudaGetLastError());
     E48      CUDA_CHECK(cudaStreamEndCapture(stream, &graph));
     E49      CUDA_CHECK(cudaGraphInstantiate(&executable, graph, nullptr, nullptr, 0));
     E50
     E51      CUDA_CHECK(cudaEventRecord(start, stream));
     E52      CUDA_CHECK(cudaGraphLaunch(executable, stream));
     E53      CUDA_CHECK(cudaEventRecord(stop, stream));
     E54      CUDA_CHECK(cudaEventSynchronize(stop));
     E55
     E56      float elapsed_ms = 0.0F;
     E57      float first = 0.0F;
     E58      CUDA_CHECK(cudaEventElapsedTime(&elapsed_ms, start, stop));
     E59      CUDA_CHECK(cudaMemcpyAsync(&first, values, sizeof(first), cudaMemcpyDeviceToHost, stream));
     E60      CUDA_CHECK(cudaStreamSynchronize(stream));
     E61
     E62      std::printf(
     E63          "gpu=%s compute_capability=%d.%d graph_kernel_ms=%.6f first=%.1f\n",
     E64          properties.name, properties.major, properties.minor, elapsed_ms, first);
     E65
     E66      CUDA_CHECK(cudaFreeAsync(values, stream));
     E67      CUDA_CHECK(cudaStreamSynchronize(stream));
     E68      CUDA_CHECK(cudaGraphExecDestroy(executable));
     E69      CUDA_CHECK(cudaGraphDestroy(graph));
     E70      CUDA_CHECK(cudaEventDestroy(stop));
     E71      CUDA_CHECK(cudaEventDestroy(start));
     E72      CUDA_CHECK(cudaStreamDestroy(stream));
     E73      return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;
     E74  }
     E75  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 75 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cuda_runtime.h>

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <cstdlib>

This comment documents `include <cstdlib>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #define CUDA_CHECK(call) \

This comment documents `define CUDA_CHECK(call) \` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 do { \

This exact expression `do { \` contributes to the surrounding CUDA Runtime API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `do { \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 const cudaError_t status = (call); \

This line binds or updates `status = (call); \` for later source in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `status = (call); \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if (status != cudaSuccess) { \

This line selects a control path using `if (status != cudaSuccess) { \` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `if (status != cudaSuccess) { \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \

This continuation line declares or passes `std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \` as part of the surrounding call or signature in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 cudaGetErrorString(status)); \

This line invokes the call chain `cudaGetErrorString` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `cudaGetErrorString` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 std::exit(EXIT_FAILURE); \

This continuation line declares or passes `std::exit(EXIT_FAILURE); \` as part of the surrounding call or signature in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `std::exit(EXIT_FAILURE); \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 } \

This exact expression `} \` contributes to the surrounding CUDA Runtime API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `} \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 } while (0)

This line invokes the call chain `while` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `while` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 __global__ void add_one(float* values, int n) {

This line begins the `add_one` callable contract used by CUDA Runtime API; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `add_one` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 const int i = blockIdx.x * blockDim.x + threadIdx.x;

This line binds or updates `i = blockIdx.x * blockDim.x + threadIdx.x` for later source in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `i = blockIdx.x * blockDim.x + threadIdx.x` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 if (i < n) {

This line selects a control path using `if (i < n) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `if (i < n) {` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 values[i] += 1.0F;

This exact expression `values[i] += 1.0F;` contributes to the surrounding CUDA Runtime API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `values[i] += 1.0F;` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 int main() {

This line begins the `main` callable contract used by CUDA Runtime API; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `main` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 constexpr int n = 1 << 20;

This line binds or updates `n = 1 << 20` for later source in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `n = 1 << 20` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 constexpr size_t bytes = n * sizeof(float);

This line calls `sizeof(...)` and binds its returned value to `bytes` for later use in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `bytes ← sizeof(...)` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 int device = 0;

This line binds or updates `device = 0` for later source in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `device = 0` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 cudaDeviceProp properties{};

This exact expression `cudaDeviceProp properties{};` contributes to the surrounding CUDA Runtime API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `cudaDeviceProp properties{};` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 CUDA_CHECK(cudaGetDevice(&device));

This line invokes the call chain `CUDA_CHECK → cudaGetDevice` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaGetDevice` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 CUDA_CHECK(cudaGetDeviceProperties(&properties, device));

This line invokes the call chain `CUDA_CHECK → cudaGetDeviceProperties` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaGetDeviceProperties` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 cudaStream_t stream{};

This exact expression `cudaStream_t stream{};` contributes to the surrounding CUDA Runtime API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `cudaStream_t stream{};` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 cudaEvent_t start{}, stop{};

This exact expression `cudaEvent_t start{}, stop{};` contributes to the surrounding CUDA Runtime API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `cudaEvent_t start{}, stop{};` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 CUDA_CHECK(cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking));

This line invokes the call chain `CUDA_CHECK → cudaStreamCreateWithFlags` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaStreamCreateWithFlags` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 CUDA_CHECK(cudaEventCreate(&start));

This line invokes the call chain `CUDA_CHECK → cudaEventCreate` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaEventCreate` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 CUDA_CHECK(cudaEventCreate(&stop));

This line invokes the call chain `CUDA_CHECK → cudaEventCreate` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaEventCreate` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 // cudaMallocAsync uses the device's default stream-ordered memory pool.

This comment documents `cudaMallocAsync uses the device's default stream-ordered memory pool.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 float* values = nullptr;

This line binds or updates `values = nullptr` for later source in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `values = nullptr` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 CUDA_CHECK(cudaMallocAsync(&values, bytes, stream));

This wrapped CUDA call requests `bytes` of stream-ordered device allocation and stores the returned address in `values`.

Source
CUDA_CHECK validates the cudaMallocAsync status while the runtime writes the allocated device pointer through `&values`.
Runtime / compiler
The CUDA allocator services the request from a stream-ordered memory pool subject to pool state and stream ordering.
GPU execution
Allocation is a runtime/allocator action, not an SM or tensor-core kernel.
Memory path
The requested byte count is explicit, but physical page backing, pool reuse, residency, and whether the allocation occupies HBM require runtime evidence.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 CUDA_CHECK(cudaMemsetAsync(values, 0, bytes, stream));

This wrapped CUDA call asynchronously fills the `values` allocation with zero for `bytes` bytes on `stream`.

Source
CUDA_CHECK validates the cudaMemsetAsync status and preserves stream ordering.
Runtime / compiler
The CUDA runtime enqueues a device-memory fill operation after earlier dependencies in the stream.
GPU execution
The runtime may use a fill kernel or device copy path; this source does not identify which execution engine is selected.
Memory path
The destination and requested byte count are explicit, but cache behavior, transactions, timing, and observed HBM writes need a run.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 cudaGraph_t graph{};

This exact expression `cudaGraph_t graph{};` contributes to the surrounding CUDA Runtime API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `cudaGraph_t graph{};` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 cudaGraphExec_t executable{};

This exact expression `cudaGraphExec_t executable{};` contributes to the surrounding CUDA Runtime API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `cudaGraphExec_t executable{};` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 CUDA_CHECK(cudaStreamBeginCapture(stream, cudaStreamCaptureModeGlobal));

This line invokes the call chain `CUDA_CHECK → cudaStreamBeginCapture` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaStreamBeginCapture` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);

This exact expression `add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);` contributes to the surrounding CUDA Runtime API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 CUDA_CHECK(cudaGetLastError());

This line invokes the call chain `CUDA_CHECK → cudaGetLastError` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaGetLastError` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 CUDA_CHECK(cudaStreamEndCapture(stream, &graph));

This line invokes the call chain `CUDA_CHECK → cudaStreamEndCapture` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaStreamEndCapture` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 CUDA_CHECK(cudaGraphInstantiate(&executable, graph, nullptr, nullptr, 0));

This line invokes the call chain `CUDA_CHECK → cudaGraphInstantiate` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaGraphInstantiate` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 CUDA_CHECK(cudaEventRecord(start, stream));

This line invokes the call chain `CUDA_CHECK → cudaEventRecord` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaEventRecord` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 CUDA_CHECK(cudaGraphLaunch(executable, stream));

This line invokes the call chain `CUDA_CHECK → cudaGraphLaunch` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaGraphLaunch` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 CUDA_CHECK(cudaEventRecord(stop, stream));

This line invokes the call chain `CUDA_CHECK → cudaEventRecord` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaEventRecord` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 CUDA_CHECK(cudaEventSynchronize(stop));

This line invokes the call chain `CUDA_CHECK → cudaEventSynchronize` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaEventSynchronize` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 float elapsed_ms = 0.0F;

This line binds or updates `elapsed_ms = 0.0F` for later source in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `elapsed_ms = 0.0F` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 float first = 0.0F;

This line binds or updates `first = 0.0F` for later source in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `first = 0.0F` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 CUDA_CHECK(cudaEventElapsedTime(&elapsed_ms, start, stop));

This wrapped CUDA call computes elapsed milliseconds between the previously recorded `start` and `stop` events.

Source
CUDA_CHECK validates the query and writes the elapsed duration through `&elapsed_ms`.
Runtime / compiler
The CUDA runtime converts completed event timestamps into a host-visible interval.
GPU execution
The timing query does not select a workload execution unit and cannot attribute time to one SM or kernel by itself.
Memory path
Elapsed time is not HBM traffic, power, energy, water, or cost; those require synchronized same-run telemetry.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 CUDA_CHECK(cudaMemcpyAsync(&first, values, sizeof(first), cudaMemcpyDeviceToHost, stream));

This call enqueues an asynchronous CUDA copy on the supplied stream.

Source
The arguments declare source, destination, byte count, transfer direction, and stream ordering.
Runtime / compiler
The CUDA runtime submits a copy operation that can overlap with other stream work subject to dependencies.
GPU execution
A copy engine or runtime-managed transfer path may perform the movement; this source does not prove the selected engine.
Memory path
Direction and byte-count arguments bound the requested movement; physical link, cache interaction, timing, and observed HBM traffic need a receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 CUDA_CHECK(cudaStreamSynchronize(stream));

This wrapped CUDA call blocks the host until all previously submitted work on `stream` completes.

Source
CUDA_CHECK surfaces synchronization failure after the runtime waits for the stream completion point.
Runtime / compiler
The host thread waits; this closes the asynchronous interval before reading results or reporting timing.
GPU execution
It waits on already selected device work and does not choose a kernel, SM, warp, or copy engine.
Memory path
Synchronization can expose transfer or kernel completion but does not itself report cache, HBM bytes, power, or energy.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E61 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E62 std::printf(

This continuation line declares or passes `std::printf(` as part of the surrounding call or signature in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `std::printf(` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E63 "gpu=%s compute_capability=%d.%d graph_kernel_ms=%.6f first=%.1f\n",

This line binds or updates `compute_capability = %d.%d graph_kernel_ms=%.6f first=%.1f\n",` for later source in CUDA Runtime API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `compute_capability = %d.%d graph_kernel_ms=%.6f first=%.1f\n",` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E64 properties.name, properties.major, properties.minor, elapsed_ms, first);

This exact expression `properties.name, properties.major, properties.minor, elapsed_ms, first);` contributes to the surrounding CUDA Runtime API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `properties.name, properties.major, properties.minor, elapsed_ms, first);` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E65 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E66 CUDA_CHECK(cudaFreeAsync(values, stream));

This line invokes the call chain `CUDA_CHECK → cudaFreeAsync` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaFreeAsync` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E67 CUDA_CHECK(cudaStreamSynchronize(stream));

This wrapped CUDA call blocks the host until all previously submitted work on `stream` completes.

Source
CUDA_CHECK surfaces synchronization failure after the runtime waits for the stream completion point.
Runtime / compiler
The host thread waits; this closes the asynchronous interval before reading results or reporting timing.
GPU execution
It waits on already selected device work and does not choose a kernel, SM, warp, or copy engine.
Memory path
Synchronization can expose transfer or kernel completion but does not itself report cache, HBM bytes, power, or energy.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E68 CUDA_CHECK(cudaGraphExecDestroy(executable));

This line invokes the call chain `CUDA_CHECK → cudaGraphExecDestroy` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaGraphExecDestroy` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E69 CUDA_CHECK(cudaGraphDestroy(graph));

This line invokes the call chain `CUDA_CHECK → cudaGraphDestroy` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaGraphDestroy` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E70 CUDA_CHECK(cudaEventDestroy(stop));

This line invokes the call chain `CUDA_CHECK → cudaEventDestroy` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaEventDestroy` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E71 CUDA_CHECK(cudaEventDestroy(start));

This line invokes the call chain `CUDA_CHECK → cudaEventDestroy` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaEventDestroy` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E72 CUDA_CHECK(cudaStreamDestroy(stream));

This line invokes the call chain `CUDA_CHECK → cudaStreamDestroy` when CUDA Runtime API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `CUDA_CHECK → cudaStreamDestroy` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E73 return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;

This line returns `return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E74 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E75 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 75 Read this exact line
#include <cuda_runtime.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/02-runtime/cuda_path.cu

Revision: not supplied

shared ir-ptx cuda coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is runtime.
  1. 01 · BEFOREWhat enters

    Framework graphs, operator definitions, specialization parameters, and compiler options.

  2. 02 · THIS SOURCEWhat role it owns

    Represents the compiler boundary between high-level operations and a target-specific executable.

  3. 03 · AFTERWhat leaves

    IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

  4. 04 · VALUEWhy anyone cares

    Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the ir-ptx layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Represents the compiler boundary between high-level operations and a target-specific executable. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Framework graphs, operator definitions, specialization parameters, and compiler options. Output boundary: IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cuda-driver CUDA Driver API 52 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUDA Driver API

cpp

REGISTERED SOURCE · 52 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/02-runtime/driver_loader.cpp

     E01  #include <cuda.h>
     E02
     E03  #include <cstdio>
     E04  #include <cstdlib>
     E05
     E06  #define CU_CHECK(call)                                                        \
     E07      do {                                                                      \
     E08          const CUresult status = (call);                                       \
     E09          if (status != CUDA_SUCCESS) {                                         \
     E10              const char* message = nullptr;                                    \
     E11              cuGetErrorString(status, &message);                               \
     E12              std::fprintf(stderr, "%s:%d Driver error: %s\n", __FILE__,       \
     E13                           __LINE__, message ? message : "unknown");            \
     E14              std::exit(EXIT_FAILURE);                                          \
     E15          }                                                                     \
     E16      } while (0)
     E17
     E18  int main(int argc, char** argv) {
     E19      if (argc != 2) {
     E20          std::fprintf(stderr, "usage: %s kernel.cubin\n", argv[0]);
     E21          return EXIT_FAILURE;
     E22      }
     E23
     E24      CU_CHECK(cuInit(0));
     E25      CUdevice device{};
     E26      CUcontext context{};
     E27      CUmodule module{};
     E28      CUfunction function{};
     E29      CUdeviceptr output{};
     E30      CU_CHECK(cuDeviceGet(&device, 0));
     E31      CU_CHECK(cuCtxCreate(&context, 0, device));
     E32      CU_CHECK(cuModuleLoad(&module, argv[1]));
     E33      CU_CHECK(cuModuleGetFunction(&function, module, "fill_kernel"));
     E34
     E35      int n = 1024;
     E36      float value = 7.0F;
     E37      CU_CHECK(cuMemAlloc(&output, n * sizeof(float)));
     E38      void* arguments[] = {&output, &n, &value};
     E39      CU_CHECK(cuLaunchKernel(function, (n + 255) / 256, 1, 1, 256, 1, 1, 0,
     E40                              nullptr, arguments, nullptr));
     E41      CU_CHECK(cuCtxSynchronize());
     E42
     E43      float first = 0.0F;
     E44      CU_CHECK(cuMemcpyDtoH(&first, output, sizeof(first)));
     E45      std::printf("module=%s first=%.1f\n", argv[1], first);
     E46
     E47      CU_CHECK(cuMemFree(output));
     E48      CU_CHECK(cuModuleUnload(module));
     E49      CU_CHECK(cuCtxDestroy(context));
     E50      return first == value ? EXIT_SUCCESS : EXIT_FAILURE;
     E51  }
     E52  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 52 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cuda.h>

This comment documents `include <cuda.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <cstdlib>

This comment documents `include <cstdlib>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #define CU_CHECK(call) \

This comment documents `define CU_CHECK(call) \` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 do { \

This exact expression `do { \` contributes to the surrounding CUDA Driver API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `do { \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 const CUresult status = (call); \

This line binds or updates `status = (call); \` for later source in CUDA Driver API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `status = (call); \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if (status != CUDA_SUCCESS) { \

This line selects a control path using `if (status != CUDA_SUCCESS) { \` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if (status != CUDA_SUCCESS) { \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 const char* message = nullptr; \

This line binds or updates `message = nullptr; \` for later source in CUDA Driver API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `message = nullptr; \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 cuGetErrorString(status, &message); \

This line invokes the call chain `cuGetErrorString` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cuGetErrorString` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 std::fprintf(stderr, "%s:%d Driver error: %s\n", __FILE__, \

This continuation line declares or passes `std::fprintf(stderr, "%s:%d Driver error: %s\n", __FILE__, \` as part of the surrounding call or signature in CUDA Driver API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `std::fprintf(stderr, "%s:%d Driver error: %s\n", __FILE__, \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 __LINE__, message ? message : "unknown"); \

This exact expression `__LINE__, message ? message : "unknown"); \` contributes to the surrounding CUDA Driver API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `__LINE__, message ? message : "unknown"); \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 std::exit(EXIT_FAILURE); \

This continuation line declares or passes `std::exit(EXIT_FAILURE); \` as part of the surrounding call or signature in CUDA Driver API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `std::exit(EXIT_FAILURE); \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 } \

This exact expression `} \` contributes to the surrounding CUDA Driver API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `} \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 } while (0)

This line invokes the call chain `while` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `while` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 int main(int argc, char** argv) {

This line begins the `main` callable contract used by CUDA Driver API; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `main` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 if (argc != 2) {

This line selects a control path using `if (argc != 2) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if (argc != 2) {` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 std::fprintf(stderr, "usage: %s kernel.cubin\n", argv[0]);

This continuation line declares or passes `std::fprintf(stderr, "usage: %s kernel.cubin\n", argv[0]);` as part of the surrounding call or signature in CUDA Driver API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `std::fprintf(stderr, "usage: %s kernel.cubin\n", argv[0]);` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 return EXIT_FAILURE;

This line returns `return EXIT_FAILURE;` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `return EXIT_FAILURE;` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 CU_CHECK(cuInit(0));

This line invokes the call chain `CU_CHECK → cuInit` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuInit` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 CUdevice device{};

This exact expression `CUdevice device{};` contributes to the surrounding CUDA Driver API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUdevice device{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 CUcontext context{};

This exact expression `CUcontext context{};` contributes to the surrounding CUDA Driver API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUcontext context{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 CUmodule module{};

This exact expression `CUmodule module{};` contributes to the surrounding CUDA Driver API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUmodule module{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 CUfunction function{};

This exact expression `CUfunction function{};` contributes to the surrounding CUDA Driver API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUfunction function{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 CUdeviceptr output{};

This exact expression `CUdeviceptr output{};` contributes to the surrounding CUDA Driver API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUdeviceptr output{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 CU_CHECK(cuDeviceGet(&device, 0));

This line invokes the call chain `CU_CHECK → cuDeviceGet` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuDeviceGet` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 CU_CHECK(cuCtxCreate(&context, 0, device));

This line invokes the call chain `CU_CHECK → cuCtxCreate` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuCtxCreate` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 CU_CHECK(cuModuleLoad(&module, argv[1]));

This line invokes the call chain `CU_CHECK → cuModuleLoad` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuModuleLoad` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 CU_CHECK(cuModuleGetFunction(&function, module, "fill_kernel"));

This line invokes the call chain `CU_CHECK → cuModuleGetFunction` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuModuleGetFunction` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 int n = 1024;

This line binds or updates `n = 1024` for later source in CUDA Driver API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `n = 1024` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 float value = 7.0F;

This line binds or updates `value = 7.0F` for later source in CUDA Driver API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `value = 7.0F` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 CU_CHECK(cuMemAlloc(&output, n * sizeof(float)));

This line invokes the call chain `CU_CHECK → cuMemAlloc → sizeof` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuMemAlloc → sizeof` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 void* arguments[] = {&output, &n, &value};

This line binds or updates `arguments[] = {&output, &n, &value}` for later source in CUDA Driver API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `arguments[] = {&output, &n, &value}` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 CU_CHECK(cuLaunchKernel(function, (n + 255) / 256, 1, 1, 256, 1, 1, 0,

This line invokes the call chain `CU_CHECK → cuLaunchKernel` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuLaunchKernel` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 nullptr, arguments, nullptr));

This exact expression `nullptr, arguments, nullptr));` contributes to the surrounding CUDA Driver API statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `nullptr, arguments, nullptr));` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 CU_CHECK(cuCtxSynchronize());

This line invokes the call chain `CU_CHECK → cuCtxSynchronize` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuCtxSynchronize` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 float first = 0.0F;

This line binds or updates `first = 0.0F` for later source in CUDA Driver API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `first = 0.0F` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 CU_CHECK(cuMemcpyDtoH(&first, output, sizeof(first)));

This line invokes the call chain `CU_CHECK → cuMemcpyDtoH → sizeof` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuMemcpyDtoH → sizeof` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 std::printf("module=%s first=%.1f\n", argv[1], first);

This line binds or updates `first = %.1f\n", argv[1], first)` for later source in CUDA Driver API. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `first = %.1f\n", argv[1], first)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 CU_CHECK(cuMemFree(output));

This line invokes the call chain `CU_CHECK → cuMemFree` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuMemFree` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 CU_CHECK(cuModuleUnload(module));

This line invokes the call chain `CU_CHECK → cuModuleUnload` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuModuleUnload` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 CU_CHECK(cuCtxDestroy(context));

This line invokes the call chain `CU_CHECK → cuCtxDestroy` when CUDA Driver API executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CU_CHECK → cuCtxDestroy` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 return first == value ? EXIT_SUCCESS : EXIT_FAILURE;

This line returns `return first == value ? EXIT_SUCCESS : EXIT_FAILURE;` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `return first == value ? EXIT_SUCCESS : EXIT_FAILURE;` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 52 Read this exact line
#include <cuda.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cuda.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/02-runtime/driver_loader.cpp

Revision: not supplied

shared engine cpp coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cpp excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is runtime.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cuda-streams-events CUDA streams and events 75 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUDA streams and events

cuda

REGISTERED SOURCE · 75 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/02-runtime/cuda_path.cu

     E01  #include <cuda_runtime.h>
     E02
     E03  #include <cstdio>
     E04  #include <cstdlib>
     E05
     E06  #define CUDA_CHECK(call)                                                        \
     E07      do {                                                                        \
     E08          const cudaError_t status = (call);                                      \
     E09          if (status != cudaSuccess) {                                            \
     E10              std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \
     E11                           cudaGetErrorString(status));                           \
     E12              std::exit(EXIT_FAILURE);                                            \
     E13          }                                                                       \
     E14      } while (0)
     E15
     E16  __global__ void add_one(float* values, int n) {
     E17      const int i = blockIdx.x * blockDim.x + threadIdx.x;
     E18      if (i < n) {
     E19          values[i] += 1.0F;
     E20      }
     E21  }
     E22
     E23  int main() {
     E24      constexpr int n = 1 << 20;
     E25      constexpr size_t bytes = n * sizeof(float);
     E26
     E27      int device = 0;
     E28      cudaDeviceProp properties{};
     E29      CUDA_CHECK(cudaGetDevice(&device));
     E30      CUDA_CHECK(cudaGetDeviceProperties(&properties, device));
     E31
     E32      cudaStream_t stream{};
     E33      cudaEvent_t start{}, stop{};
     E34      CUDA_CHECK(cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking));
     E35      CUDA_CHECK(cudaEventCreate(&start));
     E36      CUDA_CHECK(cudaEventCreate(&stop));
     E37
     E38      // cudaMallocAsync uses the device's default stream-ordered memory pool.
     E39      float* values = nullptr;
     E40      CUDA_CHECK(cudaMallocAsync(&values, bytes, stream));
     E41      CUDA_CHECK(cudaMemsetAsync(values, 0, bytes, stream));
     E42
     E43      cudaGraph_t graph{};
     E44      cudaGraphExec_t executable{};
     E45      CUDA_CHECK(cudaStreamBeginCapture(stream, cudaStreamCaptureModeGlobal));
     E46      add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);
     E47      CUDA_CHECK(cudaGetLastError());
     E48      CUDA_CHECK(cudaStreamEndCapture(stream, &graph));
     E49      CUDA_CHECK(cudaGraphInstantiate(&executable, graph, nullptr, nullptr, 0));
     E50
     E51      CUDA_CHECK(cudaEventRecord(start, stream));
     E52      CUDA_CHECK(cudaGraphLaunch(executable, stream));
     E53      CUDA_CHECK(cudaEventRecord(stop, stream));
     E54      CUDA_CHECK(cudaEventSynchronize(stop));
     E55
     E56      float elapsed_ms = 0.0F;
     E57      float first = 0.0F;
     E58      CUDA_CHECK(cudaEventElapsedTime(&elapsed_ms, start, stop));
     E59      CUDA_CHECK(cudaMemcpyAsync(&first, values, sizeof(first), cudaMemcpyDeviceToHost, stream));
     E60      CUDA_CHECK(cudaStreamSynchronize(stream));
     E61
     E62      std::printf(
     E63          "gpu=%s compute_capability=%d.%d graph_kernel_ms=%.6f first=%.1f\n",
     E64          properties.name, properties.major, properties.minor, elapsed_ms, first);
     E65
     E66      CUDA_CHECK(cudaFreeAsync(values, stream));
     E67      CUDA_CHECK(cudaStreamSynchronize(stream));
     E68      CUDA_CHECK(cudaGraphExecDestroy(executable));
     E69      CUDA_CHECK(cudaGraphDestroy(graph));
     E70      CUDA_CHECK(cudaEventDestroy(stop));
     E71      CUDA_CHECK(cudaEventDestroy(start));
     E72      CUDA_CHECK(cudaStreamDestroy(stream));
     E73      return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;
     E74  }
     E75  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 75 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cuda_runtime.h>

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <cstdlib>

This comment documents `include <cstdlib>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #define CUDA_CHECK(call) \

This comment documents `define CUDA_CHECK(call) \` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 do { \

This exact expression `do { \` contributes to the surrounding CUDA streams and events statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `do { \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 const cudaError_t status = (call); \

This line binds or updates `status = (call); \` for later source in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `status = (call); \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if (status != cudaSuccess) { \

This line selects a control path using `if (status != cudaSuccess) { \` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if (status != cudaSuccess) { \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \

This continuation line declares or passes `std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \` as part of the surrounding call or signature in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 cudaGetErrorString(status)); \

This line invokes the call chain `cudaGetErrorString` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaGetErrorString` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 std::exit(EXIT_FAILURE); \

This continuation line declares or passes `std::exit(EXIT_FAILURE); \` as part of the surrounding call or signature in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `std::exit(EXIT_FAILURE); \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 } \

This exact expression `} \` contributes to the surrounding CUDA streams and events statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `} \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 } while (0)

This line invokes the call chain `while` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `while` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 __global__ void add_one(float* values, int n) {

This line begins the `add_one` callable contract used by CUDA streams and events; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `add_one` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 const int i = blockIdx.x * blockDim.x + threadIdx.x;

This line binds or updates `i = blockIdx.x * blockDim.x + threadIdx.x` for later source in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `i = blockIdx.x * blockDim.x + threadIdx.x` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 if (i < n) {

This line selects a control path using `if (i < n) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if (i < n) {` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 values[i] += 1.0F;

This exact expression `values[i] += 1.0F;` contributes to the surrounding CUDA streams and events statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `values[i] += 1.0F;` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 int main() {

This line begins the `main` callable contract used by CUDA streams and events; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `main` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 constexpr int n = 1 << 20;

This line binds or updates `n = 1 << 20` for later source in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `n = 1 << 20` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 constexpr size_t bytes = n * sizeof(float);

This line calls `sizeof(...)` and binds its returned value to `bytes` for later use in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `bytes ← sizeof(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 int device = 0;

This line binds or updates `device = 0` for later source in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `device = 0` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 cudaDeviceProp properties{};

This exact expression `cudaDeviceProp properties{};` contributes to the surrounding CUDA streams and events statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaDeviceProp properties{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 CUDA_CHECK(cudaGetDevice(&device));

This line invokes the call chain `CUDA_CHECK → cudaGetDevice` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGetDevice` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 CUDA_CHECK(cudaGetDeviceProperties(&properties, device));

This line invokes the call chain `CUDA_CHECK → cudaGetDeviceProperties` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGetDeviceProperties` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 cudaStream_t stream{};

This exact expression `cudaStream_t stream{};` contributes to the surrounding CUDA streams and events statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaStream_t stream{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 cudaEvent_t start{}, stop{};

This exact expression `cudaEvent_t start{}, stop{};` contributes to the surrounding CUDA streams and events statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaEvent_t start{}, stop{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 CUDA_CHECK(cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking));

This line invokes the call chain `CUDA_CHECK → cudaStreamCreateWithFlags` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaStreamCreateWithFlags` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 CUDA_CHECK(cudaEventCreate(&start));

This line invokes the call chain `CUDA_CHECK → cudaEventCreate` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventCreate` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 CUDA_CHECK(cudaEventCreate(&stop));

This line invokes the call chain `CUDA_CHECK → cudaEventCreate` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventCreate` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 // cudaMallocAsync uses the device's default stream-ordered memory pool.

This comment documents `cudaMallocAsync uses the device's default stream-ordered memory pool.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 float* values = nullptr;

This line binds or updates `values = nullptr` for later source in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `values = nullptr` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 CUDA_CHECK(cudaMallocAsync(&values, bytes, stream));

This wrapped CUDA call requests `bytes` of stream-ordered device allocation and stores the returned address in `values`.

Source
CUDA_CHECK validates the cudaMallocAsync status while the runtime writes the allocated device pointer through `&values`.
Runtime / compiler
The CUDA allocator services the request from a stream-ordered memory pool subject to pool state and stream ordering.
GPU execution
Allocation is a runtime/allocator action, not an SM or tensor-core kernel.
Memory path
The requested byte count is explicit, but physical page backing, pool reuse, residency, and whether the allocation occupies HBM require runtime evidence.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 CUDA_CHECK(cudaMemsetAsync(values, 0, bytes, stream));

This wrapped CUDA call asynchronously fills the `values` allocation with zero for `bytes` bytes on `stream`.

Source
CUDA_CHECK validates the cudaMemsetAsync status and preserves stream ordering.
Runtime / compiler
The CUDA runtime enqueues a device-memory fill operation after earlier dependencies in the stream.
GPU execution
The runtime may use a fill kernel or device copy path; this source does not identify which execution engine is selected.
Memory path
The destination and requested byte count are explicit, but cache behavior, transactions, timing, and observed HBM writes need a run.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 cudaGraph_t graph{};

This exact expression `cudaGraph_t graph{};` contributes to the surrounding CUDA streams and events statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaGraph_t graph{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 cudaGraphExec_t executable{};

This exact expression `cudaGraphExec_t executable{};` contributes to the surrounding CUDA streams and events statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaGraphExec_t executable{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 CUDA_CHECK(cudaStreamBeginCapture(stream, cudaStreamCaptureModeGlobal));

This line invokes the call chain `CUDA_CHECK → cudaStreamBeginCapture` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaStreamBeginCapture` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);

This exact expression `add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);` contributes to the surrounding CUDA streams and events statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 CUDA_CHECK(cudaGetLastError());

This line invokes the call chain `CUDA_CHECK → cudaGetLastError` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGetLastError` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 CUDA_CHECK(cudaStreamEndCapture(stream, &graph));

This line invokes the call chain `CUDA_CHECK → cudaStreamEndCapture` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaStreamEndCapture` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 CUDA_CHECK(cudaGraphInstantiate(&executable, graph, nullptr, nullptr, 0));

This line invokes the call chain `CUDA_CHECK → cudaGraphInstantiate` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGraphInstantiate` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 CUDA_CHECK(cudaEventRecord(start, stream));

This line invokes the call chain `CUDA_CHECK → cudaEventRecord` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventRecord` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 CUDA_CHECK(cudaGraphLaunch(executable, stream));

This line invokes the call chain `CUDA_CHECK → cudaGraphLaunch` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGraphLaunch` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 CUDA_CHECK(cudaEventRecord(stop, stream));

This line invokes the call chain `CUDA_CHECK → cudaEventRecord` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventRecord` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 CUDA_CHECK(cudaEventSynchronize(stop));

This line invokes the call chain `CUDA_CHECK → cudaEventSynchronize` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventSynchronize` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 float elapsed_ms = 0.0F;

This line binds or updates `elapsed_ms = 0.0F` for later source in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `elapsed_ms = 0.0F` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 float first = 0.0F;

This line binds or updates `first = 0.0F` for later source in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `first = 0.0F` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 CUDA_CHECK(cudaEventElapsedTime(&elapsed_ms, start, stop));

This wrapped CUDA call computes elapsed milliseconds between the previously recorded `start` and `stop` events.

Source
CUDA_CHECK validates the query and writes the elapsed duration through `&elapsed_ms`.
Runtime / compiler
The CUDA runtime converts completed event timestamps into a host-visible interval.
GPU execution
The timing query does not select a workload execution unit and cannot attribute time to one SM or kernel by itself.
Memory path
Elapsed time is not HBM traffic, power, energy, water, or cost; those require synchronized same-run telemetry.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 CUDA_CHECK(cudaMemcpyAsync(&first, values, sizeof(first), cudaMemcpyDeviceToHost, stream));

This call enqueues an asynchronous CUDA copy on the supplied stream.

Source
The arguments declare source, destination, byte count, transfer direction, and stream ordering.
Runtime / compiler
The CUDA runtime submits a copy operation that can overlap with other stream work subject to dependencies.
GPU execution
A copy engine or runtime-managed transfer path may perform the movement; this source does not prove the selected engine.
Memory path
Direction and byte-count arguments bound the requested movement; physical link, cache interaction, timing, and observed HBM traffic need a receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 CUDA_CHECK(cudaStreamSynchronize(stream));

This wrapped CUDA call blocks the host until all previously submitted work on `stream` completes.

Source
CUDA_CHECK surfaces synchronization failure after the runtime waits for the stream completion point.
Runtime / compiler
The host thread waits; this closes the asynchronous interval before reading results or reporting timing.
GPU execution
It waits on already selected device work and does not choose a kernel, SM, warp, or copy engine.
Memory path
Synchronization can expose transfer or kernel completion but does not itself report cache, HBM bytes, power, or energy.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E61 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E62 std::printf(

This continuation line declares or passes `std::printf(` as part of the surrounding call or signature in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `std::printf(` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E63 "gpu=%s compute_capability=%d.%d graph_kernel_ms=%.6f first=%.1f\n",

This line binds or updates `compute_capability = %d.%d graph_kernel_ms=%.6f first=%.1f\n",` for later source in CUDA streams and events. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `compute_capability = %d.%d graph_kernel_ms=%.6f first=%.1f\n",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E64 properties.name, properties.major, properties.minor, elapsed_ms, first);

This exact expression `properties.name, properties.major, properties.minor, elapsed_ms, first);` contributes to the surrounding CUDA streams and events statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `properties.name, properties.major, properties.minor, elapsed_ms, first);` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E65 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E66 CUDA_CHECK(cudaFreeAsync(values, stream));

This line invokes the call chain `CUDA_CHECK → cudaFreeAsync` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaFreeAsync` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E67 CUDA_CHECK(cudaStreamSynchronize(stream));

This wrapped CUDA call blocks the host until all previously submitted work on `stream` completes.

Source
CUDA_CHECK surfaces synchronization failure after the runtime waits for the stream completion point.
Runtime / compiler
The host thread waits; this closes the asynchronous interval before reading results or reporting timing.
GPU execution
It waits on already selected device work and does not choose a kernel, SM, warp, or copy engine.
Memory path
Synchronization can expose transfer or kernel completion but does not itself report cache, HBM bytes, power, or energy.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E68 CUDA_CHECK(cudaGraphExecDestroy(executable));

This line invokes the call chain `CUDA_CHECK → cudaGraphExecDestroy` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGraphExecDestroy` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E69 CUDA_CHECK(cudaGraphDestroy(graph));

This line invokes the call chain `CUDA_CHECK → cudaGraphDestroy` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGraphDestroy` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E70 CUDA_CHECK(cudaEventDestroy(stop));

This line invokes the call chain `CUDA_CHECK → cudaEventDestroy` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventDestroy` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E71 CUDA_CHECK(cudaEventDestroy(start));

This line invokes the call chain `CUDA_CHECK → cudaEventDestroy` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventDestroy` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E72 CUDA_CHECK(cudaStreamDestroy(stream));

This line invokes the call chain `CUDA_CHECK → cudaStreamDestroy` when CUDA streams and events executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaStreamDestroy` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E73 return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;

This line returns `return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E74 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E75 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 75 Read this exact line
#include <cuda_runtime.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/02-runtime/cuda_path.cu

Revision: not supplied

shared engine cuda coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is runtime.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cuda-graphs CUDA Graphs 75 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUDA Graphs

cuda

REGISTERED SOURCE · 75 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/02-runtime/cuda_path.cu

     E01  #include <cuda_runtime.h>
     E02
     E03  #include <cstdio>
     E04  #include <cstdlib>
     E05
     E06  #define CUDA_CHECK(call)                                                        \
     E07      do {                                                                        \
     E08          const cudaError_t status = (call);                                      \
     E09          if (status != cudaSuccess) {                                            \
     E10              std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \
     E11                           cudaGetErrorString(status));                           \
     E12              std::exit(EXIT_FAILURE);                                            \
     E13          }                                                                       \
     E14      } while (0)
     E15
     E16  __global__ void add_one(float* values, int n) {
     E17      const int i = blockIdx.x * blockDim.x + threadIdx.x;
     E18      if (i < n) {
     E19          values[i] += 1.0F;
     E20      }
     E21  }
     E22
     E23  int main() {
     E24      constexpr int n = 1 << 20;
     E25      constexpr size_t bytes = n * sizeof(float);
     E26
     E27      int device = 0;
     E28      cudaDeviceProp properties{};
     E29      CUDA_CHECK(cudaGetDevice(&device));
     E30      CUDA_CHECK(cudaGetDeviceProperties(&properties, device));
     E31
     E32      cudaStream_t stream{};
     E33      cudaEvent_t start{}, stop{};
     E34      CUDA_CHECK(cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking));
     E35      CUDA_CHECK(cudaEventCreate(&start));
     E36      CUDA_CHECK(cudaEventCreate(&stop));
     E37
     E38      // cudaMallocAsync uses the device's default stream-ordered memory pool.
     E39      float* values = nullptr;
     E40      CUDA_CHECK(cudaMallocAsync(&values, bytes, stream));
     E41      CUDA_CHECK(cudaMemsetAsync(values, 0, bytes, stream));
     E42
     E43      cudaGraph_t graph{};
     E44      cudaGraphExec_t executable{};
     E45      CUDA_CHECK(cudaStreamBeginCapture(stream, cudaStreamCaptureModeGlobal));
     E46      add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);
     E47      CUDA_CHECK(cudaGetLastError());
     E48      CUDA_CHECK(cudaStreamEndCapture(stream, &graph));
     E49      CUDA_CHECK(cudaGraphInstantiate(&executable, graph, nullptr, nullptr, 0));
     E50
     E51      CUDA_CHECK(cudaEventRecord(start, stream));
     E52      CUDA_CHECK(cudaGraphLaunch(executable, stream));
     E53      CUDA_CHECK(cudaEventRecord(stop, stream));
     E54      CUDA_CHECK(cudaEventSynchronize(stop));
     E55
     E56      float elapsed_ms = 0.0F;
     E57      float first = 0.0F;
     E58      CUDA_CHECK(cudaEventElapsedTime(&elapsed_ms, start, stop));
     E59      CUDA_CHECK(cudaMemcpyAsync(&first, values, sizeof(first), cudaMemcpyDeviceToHost, stream));
     E60      CUDA_CHECK(cudaStreamSynchronize(stream));
     E61
     E62      std::printf(
     E63          "gpu=%s compute_capability=%d.%d graph_kernel_ms=%.6f first=%.1f\n",
     E64          properties.name, properties.major, properties.minor, elapsed_ms, first);
     E65
     E66      CUDA_CHECK(cudaFreeAsync(values, stream));
     E67      CUDA_CHECK(cudaStreamSynchronize(stream));
     E68      CUDA_CHECK(cudaGraphExecDestroy(executable));
     E69      CUDA_CHECK(cudaGraphDestroy(graph));
     E70      CUDA_CHECK(cudaEventDestroy(stop));
     E71      CUDA_CHECK(cudaEventDestroy(start));
     E72      CUDA_CHECK(cudaStreamDestroy(stream));
     E73      return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;
     E74  }
     E75  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 75 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cuda_runtime.h>

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <cstdlib>

This comment documents `include <cstdlib>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #define CUDA_CHECK(call) \

This comment documents `define CUDA_CHECK(call) \` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 do { \

This exact expression `do { \` contributes to the surrounding CUDA Graphs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `do { \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 const cudaError_t status = (call); \

This line binds or updates `status = (call); \` for later source in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `status = (call); \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if (status != cudaSuccess) { \

This line selects a control path using `if (status != cudaSuccess) { \` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if (status != cudaSuccess) { \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \

This continuation line declares or passes `std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \` as part of the surrounding call or signature in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 cudaGetErrorString(status)); \

This line invokes the call chain `cudaGetErrorString` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaGetErrorString` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 std::exit(EXIT_FAILURE); \

This continuation line declares or passes `std::exit(EXIT_FAILURE); \` as part of the surrounding call or signature in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `std::exit(EXIT_FAILURE); \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 } \

This exact expression `} \` contributes to the surrounding CUDA Graphs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `} \` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 } while (0)

This line invokes the call chain `while` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `while` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 __global__ void add_one(float* values, int n) {

This line begins the `add_one` callable contract used by CUDA Graphs; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `add_one` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 const int i = blockIdx.x * blockDim.x + threadIdx.x;

This line binds or updates `i = blockIdx.x * blockDim.x + threadIdx.x` for later source in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `i = blockIdx.x * blockDim.x + threadIdx.x` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 if (i < n) {

This line selects a control path using `if (i < n) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if (i < n) {` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 values[i] += 1.0F;

This exact expression `values[i] += 1.0F;` contributes to the surrounding CUDA Graphs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `values[i] += 1.0F;` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 int main() {

This line begins the `main` callable contract used by CUDA Graphs; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `main` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 constexpr int n = 1 << 20;

This line binds or updates `n = 1 << 20` for later source in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `n = 1 << 20` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 constexpr size_t bytes = n * sizeof(float);

This line calls `sizeof(...)` and binds its returned value to `bytes` for later use in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `bytes ← sizeof(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 int device = 0;

This line binds or updates `device = 0` for later source in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `device = 0` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 cudaDeviceProp properties{};

This exact expression `cudaDeviceProp properties{};` contributes to the surrounding CUDA Graphs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaDeviceProp properties{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 CUDA_CHECK(cudaGetDevice(&device));

This line invokes the call chain `CUDA_CHECK → cudaGetDevice` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGetDevice` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 CUDA_CHECK(cudaGetDeviceProperties(&properties, device));

This line invokes the call chain `CUDA_CHECK → cudaGetDeviceProperties` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGetDeviceProperties` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 cudaStream_t stream{};

This exact expression `cudaStream_t stream{};` contributes to the surrounding CUDA Graphs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaStream_t stream{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 cudaEvent_t start{}, stop{};

This exact expression `cudaEvent_t start{}, stop{};` contributes to the surrounding CUDA Graphs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaEvent_t start{}, stop{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 CUDA_CHECK(cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking));

This line invokes the call chain `CUDA_CHECK → cudaStreamCreateWithFlags` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaStreamCreateWithFlags` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 CUDA_CHECK(cudaEventCreate(&start));

This line invokes the call chain `CUDA_CHECK → cudaEventCreate` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventCreate` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 CUDA_CHECK(cudaEventCreate(&stop));

This line invokes the call chain `CUDA_CHECK → cudaEventCreate` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventCreate` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 // cudaMallocAsync uses the device's default stream-ordered memory pool.

This comment documents `cudaMallocAsync uses the device's default stream-ordered memory pool.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 float* values = nullptr;

This line binds or updates `values = nullptr` for later source in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `values = nullptr` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 CUDA_CHECK(cudaMallocAsync(&values, bytes, stream));

This wrapped CUDA call requests `bytes` of stream-ordered device allocation and stores the returned address in `values`.

Source
CUDA_CHECK validates the cudaMallocAsync status while the runtime writes the allocated device pointer through `&values`.
Runtime / compiler
The CUDA allocator services the request from a stream-ordered memory pool subject to pool state and stream ordering.
GPU execution
Allocation is a runtime/allocator action, not an SM or tensor-core kernel.
Memory path
The requested byte count is explicit, but physical page backing, pool reuse, residency, and whether the allocation occupies HBM require runtime evidence.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 CUDA_CHECK(cudaMemsetAsync(values, 0, bytes, stream));

This wrapped CUDA call asynchronously fills the `values` allocation with zero for `bytes` bytes on `stream`.

Source
CUDA_CHECK validates the cudaMemsetAsync status and preserves stream ordering.
Runtime / compiler
The CUDA runtime enqueues a device-memory fill operation after earlier dependencies in the stream.
GPU execution
The runtime may use a fill kernel or device copy path; this source does not identify which execution engine is selected.
Memory path
The destination and requested byte count are explicit, but cache behavior, transactions, timing, and observed HBM writes need a run.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 cudaGraph_t graph{};

This exact expression `cudaGraph_t graph{};` contributes to the surrounding CUDA Graphs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaGraph_t graph{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 cudaGraphExec_t executable{};

This exact expression `cudaGraphExec_t executable{};` contributes to the surrounding CUDA Graphs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cudaGraphExec_t executable{};` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 CUDA_CHECK(cudaStreamBeginCapture(stream, cudaStreamCaptureModeGlobal));

This line invokes the call chain `CUDA_CHECK → cudaStreamBeginCapture` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaStreamBeginCapture` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);

This exact expression `add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);` contributes to the surrounding CUDA Graphs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 CUDA_CHECK(cudaGetLastError());

This line invokes the call chain `CUDA_CHECK → cudaGetLastError` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGetLastError` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 CUDA_CHECK(cudaStreamEndCapture(stream, &graph));

This line invokes the call chain `CUDA_CHECK → cudaStreamEndCapture` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaStreamEndCapture` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 CUDA_CHECK(cudaGraphInstantiate(&executable, graph, nullptr, nullptr, 0));

This line invokes the call chain `CUDA_CHECK → cudaGraphInstantiate` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGraphInstantiate` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 CUDA_CHECK(cudaEventRecord(start, stream));

This line invokes the call chain `CUDA_CHECK → cudaEventRecord` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventRecord` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 CUDA_CHECK(cudaGraphLaunch(executable, stream));

This line invokes the call chain `CUDA_CHECK → cudaGraphLaunch` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGraphLaunch` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 CUDA_CHECK(cudaEventRecord(stop, stream));

This line invokes the call chain `CUDA_CHECK → cudaEventRecord` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventRecord` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 CUDA_CHECK(cudaEventSynchronize(stop));

This line invokes the call chain `CUDA_CHECK → cudaEventSynchronize` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventSynchronize` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 float elapsed_ms = 0.0F;

This line binds or updates `elapsed_ms = 0.0F` for later source in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `elapsed_ms = 0.0F` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 float first = 0.0F;

This line binds or updates `first = 0.0F` for later source in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `first = 0.0F` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 CUDA_CHECK(cudaEventElapsedTime(&elapsed_ms, start, stop));

This wrapped CUDA call computes elapsed milliseconds between the previously recorded `start` and `stop` events.

Source
CUDA_CHECK validates the query and writes the elapsed duration through `&elapsed_ms`.
Runtime / compiler
The CUDA runtime converts completed event timestamps into a host-visible interval.
GPU execution
The timing query does not select a workload execution unit and cannot attribute time to one SM or kernel by itself.
Memory path
Elapsed time is not HBM traffic, power, energy, water, or cost; those require synchronized same-run telemetry.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 CUDA_CHECK(cudaMemcpyAsync(&first, values, sizeof(first), cudaMemcpyDeviceToHost, stream));

This call enqueues an asynchronous CUDA copy on the supplied stream.

Source
The arguments declare source, destination, byte count, transfer direction, and stream ordering.
Runtime / compiler
The CUDA runtime submits a copy operation that can overlap with other stream work subject to dependencies.
GPU execution
A copy engine or runtime-managed transfer path may perform the movement; this source does not prove the selected engine.
Memory path
Direction and byte-count arguments bound the requested movement; physical link, cache interaction, timing, and observed HBM traffic need a receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 CUDA_CHECK(cudaStreamSynchronize(stream));

This wrapped CUDA call blocks the host until all previously submitted work on `stream` completes.

Source
CUDA_CHECK surfaces synchronization failure after the runtime waits for the stream completion point.
Runtime / compiler
The host thread waits; this closes the asynchronous interval before reading results or reporting timing.
GPU execution
It waits on already selected device work and does not choose a kernel, SM, warp, or copy engine.
Memory path
Synchronization can expose transfer or kernel completion but does not itself report cache, HBM bytes, power, or energy.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E61 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E62 std::printf(

This continuation line declares or passes `std::printf(` as part of the surrounding call or signature in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `std::printf(` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E63 "gpu=%s compute_capability=%d.%d graph_kernel_ms=%.6f first=%.1f\n",

This line binds or updates `compute_capability = %d.%d graph_kernel_ms=%.6f first=%.1f\n",` for later source in CUDA Graphs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `compute_capability = %d.%d graph_kernel_ms=%.6f first=%.1f\n",` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E64 properties.name, properties.major, properties.minor, elapsed_ms, first);

This exact expression `properties.name, properties.major, properties.minor, elapsed_ms, first);` contributes to the surrounding CUDA Graphs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `properties.name, properties.major, properties.minor, elapsed_ms, first);` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E65 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E66 CUDA_CHECK(cudaFreeAsync(values, stream));

This line invokes the call chain `CUDA_CHECK → cudaFreeAsync` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaFreeAsync` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E67 CUDA_CHECK(cudaStreamSynchronize(stream));

This wrapped CUDA call blocks the host until all previously submitted work on `stream` completes.

Source
CUDA_CHECK surfaces synchronization failure after the runtime waits for the stream completion point.
Runtime / compiler
The host thread waits; this closes the asynchronous interval before reading results or reporting timing.
GPU execution
It waits on already selected device work and does not choose a kernel, SM, warp, or copy engine.
Memory path
Synchronization can expose transfer or kernel completion but does not itself report cache, HBM bytes, power, or energy.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E68 CUDA_CHECK(cudaGraphExecDestroy(executable));

This line invokes the call chain `CUDA_CHECK → cudaGraphExecDestroy` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGraphExecDestroy` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E69 CUDA_CHECK(cudaGraphDestroy(graph));

This line invokes the call chain `CUDA_CHECK → cudaGraphDestroy` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaGraphDestroy` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E70 CUDA_CHECK(cudaEventDestroy(stop));

This line invokes the call chain `CUDA_CHECK → cudaEventDestroy` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventDestroy` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E71 CUDA_CHECK(cudaEventDestroy(start));

This line invokes the call chain `CUDA_CHECK → cudaEventDestroy` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaEventDestroy` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E72 CUDA_CHECK(cudaStreamDestroy(stream));

This line invokes the call chain `CUDA_CHECK → cudaStreamDestroy` when CUDA Graphs executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `CUDA_CHECK → cudaStreamDestroy` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E73 return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;

This line returns `return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E74 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E75 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 75 Read this exact line
#include <cuda_runtime.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/02-runtime/cuda_path.cu

Revision: not supplied

shared engine cuda coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is runtime.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cuda-memory-pools CUDA stream-ordered memory pools 75 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUDA stream-ordered memory pools

cuda

REGISTERED SOURCE · 75 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/02-runtime/cuda_path.cu

     E01  #include <cuda_runtime.h>
     E02
     E03  #include <cstdio>
     E04  #include <cstdlib>
     E05
     E06  #define CUDA_CHECK(call)                                                        \
     E07      do {                                                                        \
     E08          const cudaError_t status = (call);                                      \
     E09          if (status != cudaSuccess) {                                            \
     E10              std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \
     E11                           cudaGetErrorString(status));                           \
     E12              std::exit(EXIT_FAILURE);                                            \
     E13          }                                                                       \
     E14      } while (0)
     E15
     E16  __global__ void add_one(float* values, int n) {
     E17      const int i = blockIdx.x * blockDim.x + threadIdx.x;
     E18      if (i < n) {
     E19          values[i] += 1.0F;
     E20      }
     E21  }
     E22
     E23  int main() {
     E24      constexpr int n = 1 << 20;
     E25      constexpr size_t bytes = n * sizeof(float);
     E26
     E27      int device = 0;
     E28      cudaDeviceProp properties{};
     E29      CUDA_CHECK(cudaGetDevice(&device));
     E30      CUDA_CHECK(cudaGetDeviceProperties(&properties, device));
     E31
     E32      cudaStream_t stream{};
     E33      cudaEvent_t start{}, stop{};
     E34      CUDA_CHECK(cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking));
     E35      CUDA_CHECK(cudaEventCreate(&start));
     E36      CUDA_CHECK(cudaEventCreate(&stop));
     E37
     E38      // cudaMallocAsync uses the device's default stream-ordered memory pool.
     E39      float* values = nullptr;
     E40      CUDA_CHECK(cudaMallocAsync(&values, bytes, stream));
     E41      CUDA_CHECK(cudaMemsetAsync(values, 0, bytes, stream));
     E42
     E43      cudaGraph_t graph{};
     E44      cudaGraphExec_t executable{};
     E45      CUDA_CHECK(cudaStreamBeginCapture(stream, cudaStreamCaptureModeGlobal));
     E46      add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);
     E47      CUDA_CHECK(cudaGetLastError());
     E48      CUDA_CHECK(cudaStreamEndCapture(stream, &graph));
     E49      CUDA_CHECK(cudaGraphInstantiate(&executable, graph, nullptr, nullptr, 0));
     E50
     E51      CUDA_CHECK(cudaEventRecord(start, stream));
     E52      CUDA_CHECK(cudaGraphLaunch(executable, stream));
     E53      CUDA_CHECK(cudaEventRecord(stop, stream));
     E54      CUDA_CHECK(cudaEventSynchronize(stop));
     E55
     E56      float elapsed_ms = 0.0F;
     E57      float first = 0.0F;
     E58      CUDA_CHECK(cudaEventElapsedTime(&elapsed_ms, start, stop));
     E59      CUDA_CHECK(cudaMemcpyAsync(&first, values, sizeof(first), cudaMemcpyDeviceToHost, stream));
     E60      CUDA_CHECK(cudaStreamSynchronize(stream));
     E61
     E62      std::printf(
     E63          "gpu=%s compute_capability=%d.%d graph_kernel_ms=%.6f first=%.1f\n",
     E64          properties.name, properties.major, properties.minor, elapsed_ms, first);
     E65
     E66      CUDA_CHECK(cudaFreeAsync(values, stream));
     E67      CUDA_CHECK(cudaStreamSynchronize(stream));
     E68      CUDA_CHECK(cudaGraphExecDestroy(executable));
     E69      CUDA_CHECK(cudaGraphDestroy(graph));
     E70      CUDA_CHECK(cudaEventDestroy(stop));
     E71      CUDA_CHECK(cudaEventDestroy(start));
     E72      CUDA_CHECK(cudaStreamDestroy(stream));
     E73      return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;
     E74  }
     E75  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 75 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cuda_runtime.h>

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <cstdlib>

This comment documents `include <cstdlib>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #define CUDA_CHECK(call) \

This comment documents `define CUDA_CHECK(call) \` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 do { \

This exact expression `do { \` contributes to the surrounding CUDA stream-ordered memory pools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `do { \` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 const cudaError_t status = (call); \

This line binds or updates `status = (call); \` for later source in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `status = (call); \` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if (status != cudaSuccess) { \

This line selects a control path using `if (status != cudaSuccess) { \` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if (status != cudaSuccess) { \` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \

This continuation line declares or passes `std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \` as part of the surrounding call or signature in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `std::fprintf(stderr, "%s:%d CUDA error: %s\n", __FILE__, __LINE__, \` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 cudaGetErrorString(status)); \

This line invokes the call chain `cudaGetErrorString` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cudaGetErrorString` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 std::exit(EXIT_FAILURE); \

This continuation line declares or passes `std::exit(EXIT_FAILURE); \` as part of the surrounding call or signature in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `std::exit(EXIT_FAILURE); \` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 } \

This exact expression `} \` contributes to the surrounding CUDA stream-ordered memory pools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `} \` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 } while (0)

This line invokes the call chain `while` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `while` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 __global__ void add_one(float* values, int n) {

This line begins the `add_one` callable contract used by CUDA stream-ordered memory pools; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `add_one` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 const int i = blockIdx.x * blockDim.x + threadIdx.x;

This line binds or updates `i = blockIdx.x * blockDim.x + threadIdx.x` for later source in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `i = blockIdx.x * blockDim.x + threadIdx.x` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 if (i < n) {

This line selects a control path using `if (i < n) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if (i < n) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 values[i] += 1.0F;

This exact expression `values[i] += 1.0F;` contributes to the surrounding CUDA stream-ordered memory pools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `values[i] += 1.0F;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 int main() {

This line begins the `main` callable contract used by CUDA stream-ordered memory pools; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 constexpr int n = 1 << 20;

This line binds or updates `n = 1 << 20` for later source in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `n = 1 << 20` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 constexpr size_t bytes = n * sizeof(float);

This line calls `sizeof(...)` and binds its returned value to `bytes` for later use in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `bytes ← sizeof(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 int device = 0;

This line binds or updates `device = 0` for later source in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `device = 0` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 cudaDeviceProp properties{};

This exact expression `cudaDeviceProp properties{};` contributes to the surrounding CUDA stream-ordered memory pools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cudaDeviceProp properties{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 CUDA_CHECK(cudaGetDevice(&device));

This line invokes the call chain `CUDA_CHECK → cudaGetDevice` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaGetDevice` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 CUDA_CHECK(cudaGetDeviceProperties(&properties, device));

This line invokes the call chain `CUDA_CHECK → cudaGetDeviceProperties` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaGetDeviceProperties` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 cudaStream_t stream{};

This exact expression `cudaStream_t stream{};` contributes to the surrounding CUDA stream-ordered memory pools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cudaStream_t stream{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 cudaEvent_t start{}, stop{};

This exact expression `cudaEvent_t start{}, stop{};` contributes to the surrounding CUDA stream-ordered memory pools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cudaEvent_t start{}, stop{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 CUDA_CHECK(cudaStreamCreateWithFlags(&stream, cudaStreamNonBlocking));

This line invokes the call chain `CUDA_CHECK → cudaStreamCreateWithFlags` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaStreamCreateWithFlags` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 CUDA_CHECK(cudaEventCreate(&start));

This line invokes the call chain `CUDA_CHECK → cudaEventCreate` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaEventCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 CUDA_CHECK(cudaEventCreate(&stop));

This line invokes the call chain `CUDA_CHECK → cudaEventCreate` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaEventCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 // cudaMallocAsync uses the device's default stream-ordered memory pool.

This comment documents `cudaMallocAsync uses the device's default stream-ordered memory pool.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 float* values = nullptr;

This line binds or updates `values = nullptr` for later source in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `values = nullptr` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 CUDA_CHECK(cudaMallocAsync(&values, bytes, stream));

This wrapped CUDA call requests `bytes` of stream-ordered device allocation and stores the returned address in `values`.

Source
CUDA_CHECK validates the cudaMallocAsync status while the runtime writes the allocated device pointer through `&values`.
Runtime / compiler
The CUDA allocator services the request from a stream-ordered memory pool subject to pool state and stream ordering.
GPU execution
Allocation is a runtime/allocator action, not an SM or tensor-core kernel.
Memory path
The requested byte count is explicit, but physical page backing, pool reuse, residency, and whether the allocation occupies HBM require runtime evidence.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 CUDA_CHECK(cudaMemsetAsync(values, 0, bytes, stream));

This wrapped CUDA call asynchronously fills the `values` allocation with zero for `bytes` bytes on `stream`.

Source
CUDA_CHECK validates the cudaMemsetAsync status and preserves stream ordering.
Runtime / compiler
The CUDA runtime enqueues a device-memory fill operation after earlier dependencies in the stream.
GPU execution
The runtime may use a fill kernel or device copy path; this source does not identify which execution engine is selected.
Memory path
The destination and requested byte count are explicit, but cache behavior, transactions, timing, and observed HBM writes need a run.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 cudaGraph_t graph{};

This exact expression `cudaGraph_t graph{};` contributes to the surrounding CUDA stream-ordered memory pools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cudaGraph_t graph{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 cudaGraphExec_t executable{};

This exact expression `cudaGraphExec_t executable{};` contributes to the surrounding CUDA stream-ordered memory pools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cudaGraphExec_t executable{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 CUDA_CHECK(cudaStreamBeginCapture(stream, cudaStreamCaptureModeGlobal));

This line invokes the call chain `CUDA_CHECK → cudaStreamBeginCapture` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaStreamBeginCapture` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);

This exact expression `add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);` contributes to the surrounding CUDA stream-ordered memory pools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `add_one<<<(n + 255) / 256, 256, 0, stream>>>(values, n);` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 CUDA_CHECK(cudaGetLastError());

This line invokes the call chain `CUDA_CHECK → cudaGetLastError` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaGetLastError` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 CUDA_CHECK(cudaStreamEndCapture(stream, &graph));

This line invokes the call chain `CUDA_CHECK → cudaStreamEndCapture` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaStreamEndCapture` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 CUDA_CHECK(cudaGraphInstantiate(&executable, graph, nullptr, nullptr, 0));

This line invokes the call chain `CUDA_CHECK → cudaGraphInstantiate` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaGraphInstantiate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 CUDA_CHECK(cudaEventRecord(start, stream));

This line invokes the call chain `CUDA_CHECK → cudaEventRecord` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaEventRecord` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 CUDA_CHECK(cudaGraphLaunch(executable, stream));

This line invokes the call chain `CUDA_CHECK → cudaGraphLaunch` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaGraphLaunch` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 CUDA_CHECK(cudaEventRecord(stop, stream));

This line invokes the call chain `CUDA_CHECK → cudaEventRecord` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaEventRecord` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 CUDA_CHECK(cudaEventSynchronize(stop));

This line invokes the call chain `CUDA_CHECK → cudaEventSynchronize` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaEventSynchronize` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 float elapsed_ms = 0.0F;

This line binds or updates `elapsed_ms = 0.0F` for later source in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `elapsed_ms = 0.0F` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 float first = 0.0F;

This line binds or updates `first = 0.0F` for later source in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `first = 0.0F` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 CUDA_CHECK(cudaEventElapsedTime(&elapsed_ms, start, stop));

This wrapped CUDA call computes elapsed milliseconds between the previously recorded `start` and `stop` events.

Source
CUDA_CHECK validates the query and writes the elapsed duration through `&elapsed_ms`.
Runtime / compiler
The CUDA runtime converts completed event timestamps into a host-visible interval.
GPU execution
The timing query does not select a workload execution unit and cannot attribute time to one SM or kernel by itself.
Memory path
Elapsed time is not HBM traffic, power, energy, water, or cost; those require synchronized same-run telemetry.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 CUDA_CHECK(cudaMemcpyAsync(&first, values, sizeof(first), cudaMemcpyDeviceToHost, stream));

This call enqueues an asynchronous CUDA copy on the supplied stream.

Source
The arguments declare source, destination, byte count, transfer direction, and stream ordering.
Runtime / compiler
The CUDA runtime submits a copy operation that can overlap with other stream work subject to dependencies.
GPU execution
A copy engine or runtime-managed transfer path may perform the movement; this source does not prove the selected engine.
Memory path
Direction and byte-count arguments bound the requested movement; physical link, cache interaction, timing, and observed HBM traffic need a receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 CUDA_CHECK(cudaStreamSynchronize(stream));

This wrapped CUDA call blocks the host until all previously submitted work on `stream` completes.

Source
CUDA_CHECK surfaces synchronization failure after the runtime waits for the stream completion point.
Runtime / compiler
The host thread waits; this closes the asynchronous interval before reading results or reporting timing.
GPU execution
It waits on already selected device work and does not choose a kernel, SM, warp, or copy engine.
Memory path
Synchronization can expose transfer or kernel completion but does not itself report cache, HBM bytes, power, or energy.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E61 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E62 std::printf(

This continuation line declares or passes `std::printf(` as part of the surrounding call or signature in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `std::printf(` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E63 "gpu=%s compute_capability=%d.%d graph_kernel_ms=%.6f first=%.1f\n",

This line binds or updates `compute_capability = %d.%d graph_kernel_ms=%.6f first=%.1f\n",` for later source in CUDA stream-ordered memory pools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `compute_capability = %d.%d graph_kernel_ms=%.6f first=%.1f\n",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E64 properties.name, properties.major, properties.minor, elapsed_ms, first);

This exact expression `properties.name, properties.major, properties.minor, elapsed_ms, first);` contributes to the surrounding CUDA stream-ordered memory pools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `properties.name, properties.major, properties.minor, elapsed_ms, first);` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E65 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E66 CUDA_CHECK(cudaFreeAsync(values, stream));

This line invokes the call chain `CUDA_CHECK → cudaFreeAsync` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaFreeAsync` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E67 CUDA_CHECK(cudaStreamSynchronize(stream));

This wrapped CUDA call blocks the host until all previously submitted work on `stream` completes.

Source
CUDA_CHECK surfaces synchronization failure after the runtime waits for the stream completion point.
Runtime / compiler
The host thread waits; this closes the asynchronous interval before reading results or reporting timing.
GPU execution
It waits on already selected device work and does not choose a kernel, SM, warp, or copy engine.
Memory path
Synchronization can expose transfer or kernel completion but does not itself report cache, HBM bytes, power, or energy.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E68 CUDA_CHECK(cudaGraphExecDestroy(executable));

This line invokes the call chain `CUDA_CHECK → cudaGraphExecDestroy` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaGraphExecDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E69 CUDA_CHECK(cudaGraphDestroy(graph));

This line invokes the call chain `CUDA_CHECK → cudaGraphDestroy` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaGraphDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E70 CUDA_CHECK(cudaEventDestroy(stop));

This line invokes the call chain `CUDA_CHECK → cudaEventDestroy` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaEventDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E71 CUDA_CHECK(cudaEventDestroy(start));

This line invokes the call chain `CUDA_CHECK → cudaEventDestroy` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaEventDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E72 CUDA_CHECK(cudaStreamDestroy(stream));

This line invokes the call chain `CUDA_CHECK → cudaStreamDestroy` when CUDA stream-ordered memory pools executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaStreamDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E73 return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;

This line returns `return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return first == 1.0F ? EXIT_SUCCESS : EXIT_FAILURE;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E74 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E75 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 75 Read this exact line
#include <cuda_runtime.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/02-runtime/cuda_path.cu

Revision: not supplied

shared operator cuda coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is memory_management.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvcc nvcc 31 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

nvcc

bash

REGISTERED SOURCE · 31 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/02-runtime/build_artifacts.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  root="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
     E05  out="${1:-$root/out}"
     E06  mkdir -p "$out"
     E07
     E08  if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then
     E09    echo "nvidia-smi and nvcc are required" >&2
     E10    exit 2
     E11  fi
     E12
     E13  cap="$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"
     E14  case "$cap" in
     E15    ''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;
     E16  esac
     E17
     E18  nvcc -std=c++17 -arch="compute_${cap}" --ptx "$root/kernel_only.cu" -o "$out/kernel.ptx"
     E19  nvcc -std=c++17 -arch="sm_${cap}" --cubin "$root/kernel_only.cu" -o "$out/kernel.cubin"
     E20  nvcc -std=c++17 -arch="sm_${cap}" "$root/cuda_path.cu" -o "$out/cuda_path"
     E21  c++ -std=c++17 "$root/driver_loader.cpp" -I"${CUDA_HOME:-/usr/local/cuda}/include" \
     E22    -L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"
     E23
     E24  cuobjdump --dump-elf "$out/kernel.cubin" > "$out/kernel.elf.txt"
     E25  nvdisasm "$out/kernel.cubin" > "$out/kernel.sass"
     E26
     E27  "$out/cuda_path"
     E28  "$out/driver_loader" "$out/kernel.cubin"
     E29  printf 'compute_capability=%s\nptx=%s\ncubin=%s\nsass=%s\n' \
     E30    "$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"
     E31  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 31 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `/usr/bin/env bash` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 root="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

This line binds or updates `root = "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"` for later source in nvcc. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `root = "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 out="${1:-$root/out}"

This line binds or updates `out = "${1:-$root/out}"` for later source in nvcc. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `out = "${1:-$root/out}"` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 mkdir -p "$out"

This line invokes `mkdir` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `mkdir` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then

This line selects a control path using `if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "nvidia-smi and nvcc are required" >&2

This line invokes `echo` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 exit 2

This line invokes `exit` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `exit` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 fi

This line invokes `fi` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 cap="$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"

This line binds or updates `cap = "$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"` for later source in nvcc. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `cap = "$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 case "$cap" in

This line selects a control path using `case "$cap" in` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `case "$cap" in` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 ''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;

This exact expression `''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;` contributes to the surrounding nvcc statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 esac

This line invokes `esac` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `esac` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 nvcc -std=c++17 -arch="compute_${cap}" --ptx "$root/kernel_only.cu" -o "$out/kernel.ptx"

This line invokes `nvcc` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 nvcc -std=c++17 -arch="sm_${cap}" --cubin "$root/kernel_only.cu" -o "$out/kernel.cubin"

This line invokes `nvcc` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 nvcc -std=c++17 -arch="sm_${cap}" "$root/cuda_path.cu" -o "$out/cuda_path"

This line invokes `nvcc` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 c++ -std=c++17 "$root/driver_loader.cpp" -I"${CUDA_HOME:-/usr/local/cuda}/include" \

This line invokes `c++` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `c++` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 -L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"

This continuation line declares or passes `-L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"` as part of the surrounding call or signature in nvcc. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `-L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 cuobjdump --dump-elf "$out/kernel.cubin" > "$out/kernel.elf.txt"

This line invokes `cuobjdump` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cuobjdump` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvdisasm "$out/kernel.cubin" > "$out/kernel.sass"

This line invokes `nvdisasm` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvdisasm` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 "$out/cuda_path"

This exact expression `"$out/cuda_path"` contributes to the surrounding nvcc statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `"$out/cuda_path"` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 "$out/driver_loader" "$out/kernel.cubin"

This exact expression `"$out/driver_loader" "$out/kernel.cubin"` contributes to the surrounding nvcc statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `"$out/driver_loader" "$out/kernel.cubin"` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 printf 'compute_capability=%s\nptx=%s\ncubin=%s\nsass=%s\n' \

This line invokes `printf` in the nvcc source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 "$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"

This exact expression `"$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"` contributes to the surrounding nvcc statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `"$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 31 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.

What it means on the GPU

No device instruction executes until an emitted binary is loaded and launched.

How bytes could move

Artifact construction or inspection does not prove workload cache behavior or HBM traffic.

Why this line could matter to useful work

If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/02-runtime/build_artifacts.sh

Revision: not supplied

shared ir-ptx bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is compiler.
  1. 01 · BEFOREWhat enters

    Framework graphs, operator definitions, specialization parameters, and compiler options.

  2. 02 · THIS SOURCEWhat role it owns

    Represents the compiler boundary between high-level operations and a target-specific executable.

  3. 03 · AFTERWhat leaves

    IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

  4. 04 · VALUEWhy anyone cares

    Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the ir-ptx layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Represents the compiler boundary between high-level operations and a target-specific executable. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Framework graphs, operator definitions, specialization parameters, and compiler options. Output boundary: IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvrtc NVRTC 47 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVRTC

cpp

REGISTERED SOURCE · 47 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/02-runtime/nvrtc_probe.cpp

     E01  #include <cuda.h>
     E02  #include <nvrtc.h>
     E03
     E04  #include <cstdlib>
     E05  #include <iostream>
     E06  #include <string>
     E07  #include <vector>
     E08
     E09  #define NVRTC_CHECK(call)                                                     \
     E10      do {                                                                      \
     E11          const nvrtcResult status = (call);                                    \
     E12          if (status != NVRTC_SUCCESS) {                                        \
     E13              std::cerr << nvrtcGetErrorString(status) << '\n';                 \
     E14              std::exit(EXIT_FAILURE);                                          \
     E15          }                                                                     \
     E16      } while (0)
     E17
     E18  int main() {
     E19      static constexpr char source[] = R"(
     E20  extern "C" __global__ void scale(float* x, float value) {
     E21      x[threadIdx.x] *= value;
     E22  })";
     E23
     E24      nvrtcProgram program{};
     E25      NVRTC_CHECK(nvrtcCreateProgram(&program, source, "scale.cu", 0, nullptr, nullptr));
     E26      const char* options[] = {"--std=c++17"};
     E27      const nvrtcResult compile_status = nvrtcCompileProgram(program, 1, options);
     E28
     E29      size_t log_bytes = 0;
     E30      NVRTC_CHECK(nvrtcGetProgramLogSize(program, &log_bytes));
     E31      std::string log(log_bytes, '\0');
     E32      if (log_bytes > 1) {
     E33          NVRTC_CHECK(nvrtcGetProgramLog(program, log.data()));
     E34          std::cerr << log;
     E35      }
     E36      if (compile_status != NVRTC_SUCCESS) {
     E37          return EXIT_FAILURE;
     E38      }
     E39
     E40      size_t ptx_bytes = 0;
     E41      NVRTC_CHECK(nvrtcGetPTXSize(program, &ptx_bytes));
     E42      std::vector<char> ptx(ptx_bytes);
     E43      NVRTC_CHECK(nvrtcGetPTX(program, ptx.data()));
     E44      NVRTC_CHECK(nvrtcDestroyProgram(&program));
     E45      std::cout << "generated_ptx_bytes=" << ptx_bytes << '\n';
     E46  }
     E47  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 47 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cuda.h>

This comment documents `include <cuda.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 #include <nvrtc.h>

This comment documents `include <nvrtc.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <cstdlib>

This comment documents `include <cstdlib>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 #include <iostream>

This comment documents `include <iostream>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #include <string>

This comment documents `include <string>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 #include <vector>

This comment documents `include <vector>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 #define NVRTC_CHECK(call) \

This comment documents `define NVRTC_CHECK(call) \` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 do { \

This exact expression `do { \` contributes to the surrounding NVRTC statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `do { \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 const nvrtcResult status = (call); \

This line binds or updates `status = (call); \` for later source in NVRTC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `status = (call); \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 if (status != NVRTC_SUCCESS) { \

This line selects a control path using `if (status != NVRTC_SUCCESS) { \` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `if (status != NVRTC_SUCCESS) { \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 std::cerr << nvrtcGetErrorString(status) << '\n'; \

This continuation line declares or passes `std::cerr << nvrtcGetErrorString(status) << '\n'; \` as part of the surrounding call or signature in NVRTC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `std::cerr << nvrtcGetErrorString(status) << '\n'; \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 std::exit(EXIT_FAILURE); \

This continuation line declares or passes `std::exit(EXIT_FAILURE); \` as part of the surrounding call or signature in NVRTC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `std::exit(EXIT_FAILURE); \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 } \

This exact expression `} \` contributes to the surrounding NVRTC statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `} \` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 } while (0)

This line invokes the call chain `while` when NVRTC executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `while` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 int main() {

This line begins the `main` callable contract used by NVRTC; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `main` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 static constexpr char source[] = R"(

This line binds or updates `source[] = R"(` for later source in NVRTC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `source[] = R"(` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 extern "C" __global__ void scale(float* x, float value) {

This signature line declares `value` as the value tensor combined with attention probabilities.

Source
The caller must supply the value tensor combined with attention probabilities.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 x[threadIdx.x] *= value;

This exact expression `x[threadIdx.x] *= value;` contributes to the surrounding NVRTC statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `x[threadIdx.x] *= value;` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 })";

This exact expression `})";` contributes to the surrounding NVRTC statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `})";` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 nvrtcProgram program{};

This exact expression `nvrtcProgram program{};` contributes to the surrounding NVRTC statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `nvrtcProgram program{};` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 NVRTC_CHECK(nvrtcCreateProgram(&program, source, "scale.cu", 0, nullptr, nullptr));

This line invokes the call chain `NVRTC_CHECK → nvrtcCreateProgram` when NVRTC executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `NVRTC_CHECK → nvrtcCreateProgram` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 const char* options[] = {"--std=c++17"};

This line binds or updates `options[] = {"--std=c++17"}` for later source in NVRTC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `options[] = {"--std=c++17"}` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 const nvrtcResult compile_status = nvrtcCompileProgram(program, 1, options);

This line calls `nvrtcCompileProgram(...)` and binds its returned value to `compile_status` for later use in NVRTC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `compile_status ← nvrtcCompileProgram(...)` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 size_t log_bytes = 0;

This line binds or updates `log_bytes = 0` for later source in NVRTC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `log_bytes = 0` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 NVRTC_CHECK(nvrtcGetProgramLogSize(program, &log_bytes));

This line invokes the call chain `NVRTC_CHECK → nvrtcGetProgramLogSize` when NVRTC executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `NVRTC_CHECK → nvrtcGetProgramLogSize` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 std::string log(log_bytes, '\0');

This line begins the `log` callable contract used by NVRTC; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `log` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 if (log_bytes > 1) {

This line selects a control path using `if (log_bytes > 1) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `if (log_bytes > 1) {` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 NVRTC_CHECK(nvrtcGetProgramLog(program, log.data()));

This line invokes the call chain `NVRTC_CHECK → nvrtcGetProgramLog → log.data` when NVRTC executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `NVRTC_CHECK → nvrtcGetProgramLog → log.data` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 std::cerr << log;

This continuation line declares or passes `std::cerr << log;` as part of the surrounding call or signature in NVRTC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `std::cerr << log;` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 if (compile_status != NVRTC_SUCCESS) {

This line selects a control path using `if (compile_status != NVRTC_SUCCESS) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `if (compile_status != NVRTC_SUCCESS) {` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 return EXIT_FAILURE;

This line returns `return EXIT_FAILURE;` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `return EXIT_FAILURE;` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 size_t ptx_bytes = 0;

This line binds or updates `ptx_bytes = 0` for later source in NVRTC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `ptx_bytes = 0` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 NVRTC_CHECK(nvrtcGetPTXSize(program, &ptx_bytes));

This line invokes the call chain `NVRTC_CHECK → nvrtcGetPTXSize` when NVRTC executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `NVRTC_CHECK → nvrtcGetPTXSize` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 std::vector<char> ptx(ptx_bytes);

This line begins the `ptx` callable contract used by NVRTC; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `ptx` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 NVRTC_CHECK(nvrtcGetPTX(program, ptx.data()));

This line invokes the call chain `NVRTC_CHECK → nvrtcGetPTX → ptx.data` when NVRTC executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `NVRTC_CHECK → nvrtcGetPTX → ptx.data` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 NVRTC_CHECK(nvrtcDestroyProgram(&program));

This line invokes the call chain `NVRTC_CHECK → nvrtcDestroyProgram` when NVRTC executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `NVRTC_CHECK → nvrtcDestroyProgram` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 std::cout << "generated_ptx_bytes=" << ptx_bytes << '\n';

This continuation line declares or passes `std::cout << "generated_ptx_bytes=" << ptx_bytes << '\n';` as part of the surrounding call or signature in NVRTC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The compiler/artifact plane uses `std::cout << "generated_ptx_bytes=" << ptx_bytes << '\n';` to build, inspect, or represent intermediate device code.
Runtime / compiler
Toolchain execution may emit PTX, LLVM IR, HSACO, or another artifact; a build command is not the emitted instruction stream.
GPU execution
No device instruction executes until an emitted binary is loaded and launched.
Memory path
Artifact construction or inspection does not prove workload cache behavior or HBM traffic.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 47 Read this exact line
#include <cuda.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cuda.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/02-runtime/nvrtc_probe.cpp

Revision: not supplied

shared ir-ptx cpp coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cpp excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is compiler.
  1. 01 · BEFOREWhat enters

    Framework graphs, operator definitions, specialization parameters, and compiler options.

  2. 02 · THIS SOURCEWhat role it owns

    Represents the compiler boundary between high-level operations and a target-specific executable.

  3. 03 · AFTERWhat leaves

    IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

  4. 04 · VALUEWhy anyone cares

    Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the ir-ptx layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Represents the compiler boundary between high-level operations and a target-specific executable. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Framework graphs, operator definitions, specialization parameters, and compiler options. Output boundary: IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

ptx PTX ISA artifact 31 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

PTX ISA artifact

bash

REGISTERED SOURCE · 31 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/02-runtime/build_artifacts.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  root="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
     E05  out="${1:-$root/out}"
     E06  mkdir -p "$out"
     E07
     E08  if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then
     E09    echo "nvidia-smi and nvcc are required" >&2
     E10    exit 2
     E11  fi
     E12
     E13  cap="$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"
     E14  case "$cap" in
     E15    ''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;
     E16  esac
     E17
     E18  nvcc -std=c++17 -arch="compute_${cap}" --ptx "$root/kernel_only.cu" -o "$out/kernel.ptx"
     E19  nvcc -std=c++17 -arch="sm_${cap}" --cubin "$root/kernel_only.cu" -o "$out/kernel.cubin"
     E20  nvcc -std=c++17 -arch="sm_${cap}" "$root/cuda_path.cu" -o "$out/cuda_path"
     E21  c++ -std=c++17 "$root/driver_loader.cpp" -I"${CUDA_HOME:-/usr/local/cuda}/include" \
     E22    -L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"
     E23
     E24  cuobjdump --dump-elf "$out/kernel.cubin" > "$out/kernel.elf.txt"
     E25  nvdisasm "$out/kernel.cubin" > "$out/kernel.sass"
     E26
     E27  "$out/cuda_path"
     E28  "$out/driver_loader" "$out/kernel.cubin"
     E29  printf 'compute_capability=%s\nptx=%s\ncubin=%s\nsass=%s\n' \
     E30    "$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"
     E31  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 31 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 root="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

This line binds or updates `root = "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"` for later source in PTX ISA artifact. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `root = "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 out="${1:-$root/out}"

This line binds or updates `out = "${1:-$root/out}"` for later source in PTX ISA artifact. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `out = "${1:-$root/out}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 mkdir -p "$out"

This line invokes `mkdir` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `mkdir` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then

This line selects a control path using `if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "nvidia-smi and nvcc are required" >&2

This line invokes `echo` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 exit 2

This line invokes `exit` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `exit` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 fi

This line invokes `fi` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 cap="$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"

This line binds or updates `cap = "$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"` for later source in PTX ISA artifact. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cap = "$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 case "$cap" in

This line selects a control path using `case "$cap" in` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `case "$cap" in` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 ''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;

This exact expression `''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;` contributes to the surrounding PTX ISA artifact statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 esac

This line invokes `esac` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `esac` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 nvcc -std=c++17 -arch="compute_${cap}" --ptx "$root/kernel_only.cu" -o "$out/kernel.ptx"

This line invokes `nvcc` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 nvcc -std=c++17 -arch="sm_${cap}" --cubin "$root/kernel_only.cu" -o "$out/kernel.cubin"

This line invokes `nvcc` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 nvcc -std=c++17 -arch="sm_${cap}" "$root/cuda_path.cu" -o "$out/cuda_path"

This line invokes `nvcc` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 c++ -std=c++17 "$root/driver_loader.cpp" -I"${CUDA_HOME:-/usr/local/cuda}/include" \

This line invokes `c++` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `c++` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 -L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"

This continuation line declares or passes `-L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"` as part of the surrounding call or signature in PTX ISA artifact. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `-L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 cuobjdump --dump-elf "$out/kernel.cubin" > "$out/kernel.elf.txt"

This line invokes `cuobjdump` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cuobjdump` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvdisasm "$out/kernel.cubin" > "$out/kernel.sass"

This line invokes `nvdisasm` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvdisasm` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 "$out/cuda_path"

This exact expression `"$out/cuda_path"` contributes to the surrounding PTX ISA artifact statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$out/cuda_path"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 "$out/driver_loader" "$out/kernel.cubin"

This exact expression `"$out/driver_loader" "$out/kernel.cubin"` contributes to the surrounding PTX ISA artifact statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$out/driver_loader" "$out/kernel.cubin"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 printf 'compute_capability=%s\nptx=%s\ncubin=%s\nsass=%s\n' \

This line invokes `printf` in the PTX ISA artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 "$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"

This exact expression `"$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"` contributes to the surrounding PTX ISA artifact statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 31 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/02-runtime/build_artifacts.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is intermediate_representation.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cubin CUDA cubin artifact 31 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUDA cubin artifact

bash

REGISTERED SOURCE · 31 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/02-runtime/build_artifacts.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  root="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
     E05  out="${1:-$root/out}"
     E06  mkdir -p "$out"
     E07
     E08  if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then
     E09    echo "nvidia-smi and nvcc are required" >&2
     E10    exit 2
     E11  fi
     E12
     E13  cap="$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"
     E14  case "$cap" in
     E15    ''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;
     E16  esac
     E17
     E18  nvcc -std=c++17 -arch="compute_${cap}" --ptx "$root/kernel_only.cu" -o "$out/kernel.ptx"
     E19  nvcc -std=c++17 -arch="sm_${cap}" --cubin "$root/kernel_only.cu" -o "$out/kernel.cubin"
     E20  nvcc -std=c++17 -arch="sm_${cap}" "$root/cuda_path.cu" -o "$out/cuda_path"
     E21  c++ -std=c++17 "$root/driver_loader.cpp" -I"${CUDA_HOME:-/usr/local/cuda}/include" \
     E22    -L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"
     E23
     E24  cuobjdump --dump-elf "$out/kernel.cubin" > "$out/kernel.elf.txt"
     E25  nvdisasm "$out/kernel.cubin" > "$out/kernel.sass"
     E26
     E27  "$out/cuda_path"
     E28  "$out/driver_loader" "$out/kernel.cubin"
     E29  printf 'compute_capability=%s\nptx=%s\ncubin=%s\nsass=%s\n' \
     E30    "$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"
     E31  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 31 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 root="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

This line binds or updates `root = "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"` for later source in CUDA cubin artifact. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `root = "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 out="${1:-$root/out}"

This line binds or updates `out = "${1:-$root/out}"` for later source in CUDA cubin artifact. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `out = "${1:-$root/out}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 mkdir -p "$out"

This line invokes `mkdir` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `mkdir` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then

This line selects a control path using `if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "nvidia-smi and nvcc are required" >&2

This line invokes `echo` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 exit 2

This line invokes `exit` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `exit` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 fi

This line invokes `fi` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 cap="$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"

This line binds or updates `cap = "$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"` for later source in CUDA cubin artifact. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cap = "$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 case "$cap" in

This line selects a control path using `case "$cap" in` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `case "$cap" in` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 ''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;

This exact expression `''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;` contributes to the surrounding CUDA cubin artifact statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 esac

This line invokes `esac` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `esac` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 nvcc -std=c++17 -arch="compute_${cap}" --ptx "$root/kernel_only.cu" -o "$out/kernel.ptx"

This line invokes `nvcc` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 nvcc -std=c++17 -arch="sm_${cap}" --cubin "$root/kernel_only.cu" -o "$out/kernel.cubin"

This line invokes `nvcc` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 nvcc -std=c++17 -arch="sm_${cap}" "$root/cuda_path.cu" -o "$out/cuda_path"

This line invokes `nvcc` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 c++ -std=c++17 "$root/driver_loader.cpp" -I"${CUDA_HOME:-/usr/local/cuda}/include" \

This line invokes `c++` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `c++` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 -L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"

This continuation line declares or passes `-L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"` as part of the surrounding call or signature in CUDA cubin artifact. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `-L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 cuobjdump --dump-elf "$out/kernel.cubin" > "$out/kernel.elf.txt"

This line invokes `cuobjdump` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cuobjdump` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvdisasm "$out/kernel.cubin" > "$out/kernel.sass"

This line invokes `nvdisasm` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvdisasm` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 "$out/cuda_path"

This exact expression `"$out/cuda_path"` contributes to the surrounding CUDA cubin artifact statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$out/cuda_path"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 "$out/driver_loader" "$out/kernel.cubin"

This exact expression `"$out/driver_loader" "$out/kernel.cubin"` contributes to the surrounding CUDA cubin artifact statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$out/driver_loader" "$out/kernel.cubin"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 printf 'compute_capability=%s\nptx=%s\ncubin=%s\nsass=%s\n' \

This line invokes `printf` in the CUDA cubin artifact source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 "$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"

This exact expression `"$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"` contributes to the surrounding CUDA cubin artifact statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 31 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/02-runtime/build_artifacts.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is binary_artifact.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

sass SASS disassembly 31 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

SASS disassembly

bash

REGISTERED SOURCE · 31 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/02-runtime/build_artifacts.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  root="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
     E05  out="${1:-$root/out}"
     E06  mkdir -p "$out"
     E07
     E08  if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then
     E09    echo "nvidia-smi and nvcc are required" >&2
     E10    exit 2
     E11  fi
     E12
     E13  cap="$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"
     E14  case "$cap" in
     E15    ''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;
     E16  esac
     E17
     E18  nvcc -std=c++17 -arch="compute_${cap}" --ptx "$root/kernel_only.cu" -o "$out/kernel.ptx"
     E19  nvcc -std=c++17 -arch="sm_${cap}" --cubin "$root/kernel_only.cu" -o "$out/kernel.cubin"
     E20  nvcc -std=c++17 -arch="sm_${cap}" "$root/cuda_path.cu" -o "$out/cuda_path"
     E21  c++ -std=c++17 "$root/driver_loader.cpp" -I"${CUDA_HOME:-/usr/local/cuda}/include" \
     E22    -L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"
     E23
     E24  cuobjdump --dump-elf "$out/kernel.cubin" > "$out/kernel.elf.txt"
     E25  nvdisasm "$out/kernel.cubin" > "$out/kernel.sass"
     E26
     E27  "$out/cuda_path"
     E28  "$out/driver_loader" "$out/kernel.cubin"
     E29  printf 'compute_capability=%s\nptx=%s\ncubin=%s\nsass=%s\n' \
     E30    "$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"
     E31  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 31 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 root="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

This line binds or updates `root = "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"` for later source in SASS disassembly. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `root = "$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 out="${1:-$root/out}"

This line binds or updates `out = "${1:-$root/out}"` for later source in SASS disassembly. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `out = "${1:-$root/out}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 mkdir -p "$out"

This line invokes `mkdir` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `mkdir` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then

This line selects a control path using `if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if ! command -v nvidia-smi >/dev/null || ! command -v nvcc >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "nvidia-smi and nvcc are required" >&2

This line invokes `echo` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 exit 2

This line invokes `exit` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `exit` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 fi

This line invokes `fi` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 cap="$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"

This line binds or updates `cap = "$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"` for later source in SASS disassembly. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cap = "$(nvidia-smi --query-gpu=compute_cap --format=csv,noheader | sed -n '1p' | tr -d '.')"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 case "$cap" in

This line selects a control path using `case "$cap" in` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `case "$cap" in` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 ''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;

This exact expression `''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;` contributes to the surrounding SASS disassembly statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `''|*[!0-9]*) echo "unable to detect compute capability" >&2; exit 2 ;;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 esac

This line invokes `esac` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `esac` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 nvcc -std=c++17 -arch="compute_${cap}" --ptx "$root/kernel_only.cu" -o "$out/kernel.ptx"

This line invokes `nvcc` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 nvcc -std=c++17 -arch="sm_${cap}" --cubin "$root/kernel_only.cu" -o "$out/kernel.cubin"

This line invokes `nvcc` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 nvcc -std=c++17 -arch="sm_${cap}" "$root/cuda_path.cu" -o "$out/cuda_path"

This line invokes `nvcc` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvcc` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 c++ -std=c++17 "$root/driver_loader.cpp" -I"${CUDA_HOME:-/usr/local/cuda}/include" \

This line invokes `c++` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `c++` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 -L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"

This continuation line declares or passes `-L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"` as part of the surrounding call or signature in SASS disassembly. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `-L"${CUDA_HOME:-/usr/local/cuda}/lib64" -lcuda -o "$out/driver_loader"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 cuobjdump --dump-elf "$out/kernel.cubin" > "$out/kernel.elf.txt"

This line invokes `cuobjdump` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cuobjdump` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvdisasm "$out/kernel.cubin" > "$out/kernel.sass"

This line invokes `nvdisasm` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvdisasm` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 "$out/cuda_path"

This exact expression `"$out/cuda_path"` contributes to the surrounding SASS disassembly statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$out/cuda_path"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 "$out/driver_loader" "$out/kernel.cubin"

This exact expression `"$out/driver_loader" "$out/kernel.cubin"` contributes to the surrounding SASS disassembly statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$out/driver_loader" "$out/kernel.cubin"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 printf 'compute_capability=%s\nptx=%s\ncubin=%s\nsass=%s\n' \

This line invokes `printf` in the SASS disassembly source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 "$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"

This exact expression `"$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"` contributes to the surrounding SASS disassembly statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$cap" "$out/kernel.ptx" "$out/kernel.cubin" "$out/kernel.sass"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 31 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/02-runtime/build_artifacts.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is machine_instruction_artifact.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cublas cuBLAS 75 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuBLAS

cuda

REGISTERED SOURCE · 75 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/03-kernels/gemm_paths.cu

     E01  #include <cublasLt.h>
     E02  #include <cublas_v2.h>
     E03  #include <cuda_runtime.h>
     E04
     E05  #include <cstdio>
     E06  #include <cstdlib>
     E07
     E08  #define CHECK_CUDA(call) do { if ((call) != cudaSuccess) std::exit(2); } while (0)
     E09  #define CHECK_BLAS(call) do { if ((call) != CUBLAS_STATUS_SUCCESS) std::exit(3); } while (0)
     E10
     E11  int main() {
     E12      constexpr int m = 128, n = 128, k = 128;
     E13      constexpr size_t a_bytes = m * k * sizeof(float);
     E14      constexpr size_t b_bytes = k * n * sizeof(float);
     E15      constexpr size_t c_bytes = m * n * sizeof(float);
     E16      float *a = nullptr, *b = nullptr, *c = nullptr;
     E17      CHECK_CUDA(cudaMalloc(&a, a_bytes));
     E18      CHECK_CUDA(cudaMalloc(&b, b_bytes));
     E19      CHECK_CUDA(cudaMalloc(&c, c_bytes));
     E20      CHECK_CUDA(cudaMemset(a, 0, a_bytes));
     E21      CHECK_CUDA(cudaMemset(b, 0, b_bytes));
     E22
     E23      const float alpha = 1.0F, beta = 0.0F;
     E24      cublasHandle_t blas{};
     E25      CHECK_BLAS(cublasCreate(&blas));
     E26      CHECK_BLAS(cublasSgemm(blas, CUBLAS_OP_N, CUBLAS_OP_N, m, n, k,
     E27                             &alpha, a, m, b, k, &beta, c, m));
     E28      CHECK_CUDA(cudaDeviceSynchronize());
     E29      CHECK_BLAS(cublasDestroy(blas));
     E30
     E31      cublasLtHandle_t lt{};
     E32      cublasLtMatmulDesc_t operation{};
     E33      cublasLtMatrixLayout_t a_layout{}, b_layout{}, c_layout{};
     E34      cublasLtMatmulPreference_t preference{};
     E35      CHECK_BLAS(cublasLtCreate(&lt));
     E36      CHECK_BLAS(cublasLtMatmulDescCreate(&operation, CUBLAS_COMPUTE_32F, CUDA_R_32F));
     E37      CHECK_BLAS(cublasLtMatrixLayoutCreate(&a_layout, CUDA_R_32F, m, k, m));
     E38      CHECK_BLAS(cublasLtMatrixLayoutCreate(&b_layout, CUDA_R_32F, k, n, k));
     E39      CHECK_BLAS(cublasLtMatrixLayoutCreate(&c_layout, CUDA_R_32F, m, n, m));
     E40      CHECK_BLAS(cublasLtMatmulPreferenceCreate(&preference));
     E41
     E42      constexpr size_t workspace_bytes = 4 << 20;
     E43      void* workspace = nullptr;
     E44      CHECK_CUDA(cudaMalloc(&workspace, workspace_bytes));
     E45      CHECK_BLAS(cublasLtMatmulPreferenceSetAttribute(
     E46          preference, CUBLASLT_MATMUL_PREF_MAX_WORKSPACE_BYTES,
     E47          &workspace_bytes, sizeof(workspace_bytes)));
     E48      cublasLtMatmulHeuristicResult_t heuristic{};
     E49      int returned = 0;
     E50      CHECK_BLAS(cublasLtMatmulAlgoGetHeuristic(
     E51          lt, operation, a_layout, b_layout, c_layout, c_layout,
     E52          preference, 1, &heuristic, &returned));
     E53      if (returned == 0) {
     E54          std::fprintf(stderr, "no cuBLASLt heuristic\n");
     E55          return 4;
     E56      }
     E57      CHECK_BLAS(cublasLtMatmul(
     E58          lt, operation, &alpha, a, a_layout, b, b_layout, &beta, c, c_layout,
     E59          c, c_layout, &heuristic.algo, workspace, workspace_bytes, nullptr));
     E60      CHECK_CUDA(cudaDeviceSynchronize());
     E61
     E62      std::printf("cublas_baseline=ok cublaslt_heuristic=ok workspace_bytes=%zu\n",
     E63                  workspace_bytes);
     E64      CHECK_CUDA(cudaFree(workspace));
     E65      CHECK_BLAS(cublasLtMatmulPreferenceDestroy(preference));
     E66      CHECK_BLAS(cublasLtMatrixLayoutDestroy(c_layout));
     E67      CHECK_BLAS(cublasLtMatrixLayoutDestroy(b_layout));
     E68      CHECK_BLAS(cublasLtMatrixLayoutDestroy(a_layout));
     E69      CHECK_BLAS(cublasLtMatmulDescDestroy(operation));
     E70      CHECK_BLAS(cublasLtDestroy(lt));
     E71      CHECK_CUDA(cudaFree(c));
     E72      CHECK_CUDA(cudaFree(b));
     E73      CHECK_CUDA(cudaFree(a));
     E74  }
     E75  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 75 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cublasLt.h>

This comment documents `include <cublasLt.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 #include <cublas_v2.h>

This comment documents `include <cublas_v2.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cuda_runtime.h>

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #include <cstdlib>

This comment documents `include <cstdlib>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 #define CHECK_CUDA(call) do { if ((call) != cudaSuccess) std::exit(2); } while (0)

This comment documents `define CHECK_CUDA(call) do { if ((call) != cudaSuccess) std::exit(2); } while (0)` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 #define CHECK_BLAS(call) do { if ((call) != CUBLAS_STATUS_SUCCESS) std::exit(3); } while (0)

This comment documents `define CHECK_BLAS(call) do { if ((call) != CUBLAS_STATUS_SUCCESS) std::exit(3); } while…` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 int main() {

This line begins the `main` callable contract used by cuBLAS; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 constexpr int m = 128, n = 128, k = 128;

This line binds or updates `m = 128, n = 128, k = 128` for later source in cuBLAS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `m = 128, n = 128, k = 128` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 constexpr size_t a_bytes = m * k * sizeof(float);

This line calls `sizeof(...)` and binds its returned value to `a_bytes` for later use in cuBLAS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `a_bytes ← sizeof(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 constexpr size_t b_bytes = k * n * sizeof(float);

This line calls `sizeof(...)` and binds its returned value to `b_bytes` for later use in cuBLAS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `b_bytes ← sizeof(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 constexpr size_t c_bytes = m * n * sizeof(float);

This line calls `sizeof(...)` and binds its returned value to `c_bytes` for later use in cuBLAS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `c_bytes ← sizeof(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 float *a = nullptr, *b = nullptr, *c = nullptr;

This exact expression `float *a = nullptr, *b = nullptr, *c = nullptr;` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `float *a = nullptr, *b = nullptr, *c = nullptr;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 CHECK_CUDA(cudaMalloc(&a, a_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMalloc` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMalloc` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 CHECK_CUDA(cudaMalloc(&b, b_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMalloc` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMalloc` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 CHECK_CUDA(cudaMalloc(&c, c_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMalloc` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMalloc` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 CHECK_CUDA(cudaMemset(a, 0, a_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMemset` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMemset` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 CHECK_CUDA(cudaMemset(b, 0, b_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMemset` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMemset` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 const float alpha = 1.0F, beta = 0.0F;

This line binds or updates `alpha = 1.0F, beta = 0.0F` for later source in cuBLAS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `alpha = 1.0F, beta = 0.0F` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 cublasHandle_t blas{};

This exact expression `cublasHandle_t blas{};` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasHandle_t blas{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 CHECK_BLAS(cublasCreate(&blas));

This line invokes the call chain `CHECK_BLAS → cublasCreate` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 CHECK_BLAS(cublasSgemm(blas, CUBLAS_OP_N, CUBLAS_OP_N, m, n, k,

This line invokes the call chain `CHECK_BLAS → cublasSgemm` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasSgemm` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 &alpha, a, m, b, k, &beta, c, m));

This exact expression `&alpha, a, m, b, k, &beta, c, m));` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `&alpha, a, m, b, k, &beta, c, m));` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 CHECK_CUDA(cudaDeviceSynchronize());

This line invokes the call chain `CHECK_CUDA → cudaDeviceSynchronize` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaDeviceSynchronize` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 CHECK_BLAS(cublasDestroy(blas));

This line invokes the call chain `CHECK_BLAS → cublasDestroy` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 cublasLtHandle_t lt{};

This exact expression `cublasLtHandle_t lt{};` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasLtHandle_t lt{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 cublasLtMatmulDesc_t operation{};

This exact expression `cublasLtMatmulDesc_t operation{};` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasLtMatmulDesc_t operation{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 cublasLtMatrixLayout_t a_layout{}, b_layout{}, c_layout{};

This exact expression `cublasLtMatrixLayout_t a_layout{}, b_layout{}, c_layout{};` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasLtMatrixLayout_t a_layout{}, b_layout{}, c_layout{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 cublasLtMatmulPreference_t preference{};

This exact expression `cublasLtMatmulPreference_t preference{};` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasLtMatmulPreference_t preference{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 CHECK_BLAS(cublasLtCreate(&lt));

This line invokes the call chain `CHECK_BLAS → cublasLtCreate` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 CHECK_BLAS(cublasLtMatmulDescCreate(&operation, CUBLAS_COMPUTE_32F, CUDA_R_32F));

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulDescCreate` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulDescCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 CHECK_BLAS(cublasLtMatrixLayoutCreate(&a_layout, CUDA_R_32F, m, k, m));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutCreate` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 CHECK_BLAS(cublasLtMatrixLayoutCreate(&b_layout, CUDA_R_32F, k, n, k));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutCreate` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 CHECK_BLAS(cublasLtMatrixLayoutCreate(&c_layout, CUDA_R_32F, m, n, m));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutCreate` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 CHECK_BLAS(cublasLtMatmulPreferenceCreate(&preference));

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulPreferenceCreate` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulPreferenceCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 constexpr size_t workspace_bytes = 4 << 20;

This line binds or updates `workspace_bytes = 4 << 20` for later source in cuBLAS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `workspace_bytes = 4 << 20` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 void* workspace = nullptr;

This line binds or updates `workspace = nullptr` for later source in cuBLAS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `workspace = nullptr` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 CHECK_CUDA(cudaMalloc(&workspace, workspace_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMalloc` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMalloc` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 CHECK_BLAS(cublasLtMatmulPreferenceSetAttribute(

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulPreferenceSetAttribute` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulPreferenceSetAttribute` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 preference, CUBLASLT_MATMUL_PREF_MAX_WORKSPACE_BYTES,

This exact expression `preference, CUBLASLT_MATMUL_PREF_MAX_WORKSPACE_BYTES,` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `preference, CUBLASLT_MATMUL_PREF_MAX_WORKSPACE_BYTES,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 &workspace_bytes, sizeof(workspace_bytes)));

This line invokes the call chain `sizeof` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `sizeof` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 cublasLtMatmulHeuristicResult_t heuristic{};

This exact expression `cublasLtMatmulHeuristicResult_t heuristic{};` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasLtMatmulHeuristicResult_t heuristic{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 int returned = 0;

This line binds or updates `returned = 0` for later source in cuBLAS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `returned = 0` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 CHECK_BLAS(cublasLtMatmulAlgoGetHeuristic(

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulAlgoGetHeuristic` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulAlgoGetHeuristic` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 lt, operation, a_layout, b_layout, c_layout, c_layout,

This exact expression `lt, operation, a_layout, b_layout, c_layout, c_layout,` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `lt, operation, a_layout, b_layout, c_layout, c_layout,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 preference, 1, &heuristic, &returned));

This exact expression `preference, 1, &heuristic, &returned));` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `preference, 1, &heuristic, &returned));` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 if (returned == 0) {

This line selects a control path using `if (returned == 0) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if (returned == 0) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 std::fprintf(stderr, "no cuBLASLt heuristic\n");

This continuation line declares or passes `std::fprintf(stderr, "no cuBLASLt heuristic\n");` as part of the surrounding call or signature in cuBLAS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `std::fprintf(stderr, "no cuBLASLt heuristic\n");` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 return 4;

This line returns `return 4;` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return 4;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 CHECK_BLAS(cublasLtMatmul(

This line invokes the call chain `CHECK_BLAS → cublasLtMatmul` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmul` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 lt, operation, &alpha, a, a_layout, b, b_layout, &beta, c, c_layout,

This exact expression `lt, operation, &alpha, a, a_layout, b, b_layout, &beta, c, c_layout,` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `lt, operation, &alpha, a, a_layout, b, b_layout, &beta, c, c_layout,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 c, c_layout, &heuristic.algo, workspace, workspace_bytes, nullptr));

This exact expression `c, c_layout, &heuristic.algo, workspace, workspace_bytes, nullptr));` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `c, c_layout, &heuristic.algo, workspace, workspace_bytes, nullptr));` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 CHECK_CUDA(cudaDeviceSynchronize());

This line invokes the call chain `CHECK_CUDA → cudaDeviceSynchronize` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaDeviceSynchronize` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E61 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E62 std::printf("cublas_baseline=ok cublaslt_heuristic=ok workspace_bytes=%zu\n",

This line binds or updates `cublaslt_heuristic = ok workspace_bytes=%zu\n",` for later source in cuBLAS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublaslt_heuristic = ok workspace_bytes=%zu\n",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E63 workspace_bytes);

This exact expression `workspace_bytes);` contributes to the surrounding cuBLAS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `workspace_bytes);` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E64 CHECK_CUDA(cudaFree(workspace));

This line invokes the call chain `CHECK_CUDA → cudaFree` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaFree` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E65 CHECK_BLAS(cublasLtMatmulPreferenceDestroy(preference));

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulPreferenceDestroy` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulPreferenceDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E66 CHECK_BLAS(cublasLtMatrixLayoutDestroy(c_layout));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutDestroy` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E67 CHECK_BLAS(cublasLtMatrixLayoutDestroy(b_layout));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutDestroy` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E68 CHECK_BLAS(cublasLtMatrixLayoutDestroy(a_layout));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutDestroy` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E69 CHECK_BLAS(cublasLtMatmulDescDestroy(operation));

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulDescDestroy` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulDescDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E70 CHECK_BLAS(cublasLtDestroy(lt));

This line invokes the call chain `CHECK_BLAS → cublasLtDestroy` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E71 CHECK_CUDA(cudaFree(c));

This line invokes the call chain `CHECK_CUDA → cudaFree` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaFree` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E72 CHECK_CUDA(cudaFree(b));

This line invokes the call chain `CHECK_CUDA → cudaFree` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaFree` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E73 CHECK_CUDA(cudaFree(a));

This line invokes the call chain `CHECK_CUDA → cudaFree` when cuBLAS executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaFree` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E74 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E75 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 75 Read this exact line
#include <cublasLt.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cublasLt.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/03-kernels/gemm_paths.cu

Revision: not supplied

shared operator cuda coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is math_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cublaslt cuBLASLt 75 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuBLASLt

cuda

REGISTERED SOURCE · 75 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/03-kernels/gemm_paths.cu

     E01  #include <cublasLt.h>
     E02  #include <cublas_v2.h>
     E03  #include <cuda_runtime.h>
     E04
     E05  #include <cstdio>
     E06  #include <cstdlib>
     E07
     E08  #define CHECK_CUDA(call) do { if ((call) != cudaSuccess) std::exit(2); } while (0)
     E09  #define CHECK_BLAS(call) do { if ((call) != CUBLAS_STATUS_SUCCESS) std::exit(3); } while (0)
     E10
     E11  int main() {
     E12      constexpr int m = 128, n = 128, k = 128;
     E13      constexpr size_t a_bytes = m * k * sizeof(float);
     E14      constexpr size_t b_bytes = k * n * sizeof(float);
     E15      constexpr size_t c_bytes = m * n * sizeof(float);
     E16      float *a = nullptr, *b = nullptr, *c = nullptr;
     E17      CHECK_CUDA(cudaMalloc(&a, a_bytes));
     E18      CHECK_CUDA(cudaMalloc(&b, b_bytes));
     E19      CHECK_CUDA(cudaMalloc(&c, c_bytes));
     E20      CHECK_CUDA(cudaMemset(a, 0, a_bytes));
     E21      CHECK_CUDA(cudaMemset(b, 0, b_bytes));
     E22
     E23      const float alpha = 1.0F, beta = 0.0F;
     E24      cublasHandle_t blas{};
     E25      CHECK_BLAS(cublasCreate(&blas));
     E26      CHECK_BLAS(cublasSgemm(blas, CUBLAS_OP_N, CUBLAS_OP_N, m, n, k,
     E27                             &alpha, a, m, b, k, &beta, c, m));
     E28      CHECK_CUDA(cudaDeviceSynchronize());
     E29      CHECK_BLAS(cublasDestroy(blas));
     E30
     E31      cublasLtHandle_t lt{};
     E32      cublasLtMatmulDesc_t operation{};
     E33      cublasLtMatrixLayout_t a_layout{}, b_layout{}, c_layout{};
     E34      cublasLtMatmulPreference_t preference{};
     E35      CHECK_BLAS(cublasLtCreate(&lt));
     E36      CHECK_BLAS(cublasLtMatmulDescCreate(&operation, CUBLAS_COMPUTE_32F, CUDA_R_32F));
     E37      CHECK_BLAS(cublasLtMatrixLayoutCreate(&a_layout, CUDA_R_32F, m, k, m));
     E38      CHECK_BLAS(cublasLtMatrixLayoutCreate(&b_layout, CUDA_R_32F, k, n, k));
     E39      CHECK_BLAS(cublasLtMatrixLayoutCreate(&c_layout, CUDA_R_32F, m, n, m));
     E40      CHECK_BLAS(cublasLtMatmulPreferenceCreate(&preference));
     E41
     E42      constexpr size_t workspace_bytes = 4 << 20;
     E43      void* workspace = nullptr;
     E44      CHECK_CUDA(cudaMalloc(&workspace, workspace_bytes));
     E45      CHECK_BLAS(cublasLtMatmulPreferenceSetAttribute(
     E46          preference, CUBLASLT_MATMUL_PREF_MAX_WORKSPACE_BYTES,
     E47          &workspace_bytes, sizeof(workspace_bytes)));
     E48      cublasLtMatmulHeuristicResult_t heuristic{};
     E49      int returned = 0;
     E50      CHECK_BLAS(cublasLtMatmulAlgoGetHeuristic(
     E51          lt, operation, a_layout, b_layout, c_layout, c_layout,
     E52          preference, 1, &heuristic, &returned));
     E53      if (returned == 0) {
     E54          std::fprintf(stderr, "no cuBLASLt heuristic\n");
     E55          return 4;
     E56      }
     E57      CHECK_BLAS(cublasLtMatmul(
     E58          lt, operation, &alpha, a, a_layout, b, b_layout, &beta, c, c_layout,
     E59          c, c_layout, &heuristic.algo, workspace, workspace_bytes, nullptr));
     E60      CHECK_CUDA(cudaDeviceSynchronize());
     E61
     E62      std::printf("cublas_baseline=ok cublaslt_heuristic=ok workspace_bytes=%zu\n",
     E63                  workspace_bytes);
     E64      CHECK_CUDA(cudaFree(workspace));
     E65      CHECK_BLAS(cublasLtMatmulPreferenceDestroy(preference));
     E66      CHECK_BLAS(cublasLtMatrixLayoutDestroy(c_layout));
     E67      CHECK_BLAS(cublasLtMatrixLayoutDestroy(b_layout));
     E68      CHECK_BLAS(cublasLtMatrixLayoutDestroy(a_layout));
     E69      CHECK_BLAS(cublasLtMatmulDescDestroy(operation));
     E70      CHECK_BLAS(cublasLtDestroy(lt));
     E71      CHECK_CUDA(cudaFree(c));
     E72      CHECK_CUDA(cudaFree(b));
     E73      CHECK_CUDA(cudaFree(a));
     E74  }
     E75  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 75 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cublasLt.h>

This comment documents `include <cublasLt.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 #include <cublas_v2.h>

This comment documents `include <cublas_v2.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cuda_runtime.h>

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #include <cstdlib>

This comment documents `include <cstdlib>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 #define CHECK_CUDA(call) do { if ((call) != cudaSuccess) std::exit(2); } while (0)

This comment documents `define CHECK_CUDA(call) do { if ((call) != cudaSuccess) std::exit(2); } while (0)` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 #define CHECK_BLAS(call) do { if ((call) != CUBLAS_STATUS_SUCCESS) std::exit(3); } while (0)

This comment documents `define CHECK_BLAS(call) do { if ((call) != CUBLAS_STATUS_SUCCESS) std::exit(3); } while…` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 int main() {

This line begins the `main` callable contract used by cuBLASLt; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 constexpr int m = 128, n = 128, k = 128;

This line binds or updates `m = 128, n = 128, k = 128` for later source in cuBLASLt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `m = 128, n = 128, k = 128` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 constexpr size_t a_bytes = m * k * sizeof(float);

This line calls `sizeof(...)` and binds its returned value to `a_bytes` for later use in cuBLASLt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `a_bytes ← sizeof(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 constexpr size_t b_bytes = k * n * sizeof(float);

This line calls `sizeof(...)` and binds its returned value to `b_bytes` for later use in cuBLASLt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `b_bytes ← sizeof(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 constexpr size_t c_bytes = m * n * sizeof(float);

This line calls `sizeof(...)` and binds its returned value to `c_bytes` for later use in cuBLASLt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `c_bytes ← sizeof(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 float *a = nullptr, *b = nullptr, *c = nullptr;

This exact expression `float *a = nullptr, *b = nullptr, *c = nullptr;` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `float *a = nullptr, *b = nullptr, *c = nullptr;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 CHECK_CUDA(cudaMalloc(&a, a_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMalloc` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMalloc` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 CHECK_CUDA(cudaMalloc(&b, b_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMalloc` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMalloc` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 CHECK_CUDA(cudaMalloc(&c, c_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMalloc` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMalloc` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 CHECK_CUDA(cudaMemset(a, 0, a_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMemset` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMemset` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 CHECK_CUDA(cudaMemset(b, 0, b_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMemset` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMemset` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 const float alpha = 1.0F, beta = 0.0F;

This line binds or updates `alpha = 1.0F, beta = 0.0F` for later source in cuBLASLt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `alpha = 1.0F, beta = 0.0F` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 cublasHandle_t blas{};

This exact expression `cublasHandle_t blas{};` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasHandle_t blas{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 CHECK_BLAS(cublasCreate(&blas));

This line invokes the call chain `CHECK_BLAS → cublasCreate` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 CHECK_BLAS(cublasSgemm(blas, CUBLAS_OP_N, CUBLAS_OP_N, m, n, k,

This line invokes the call chain `CHECK_BLAS → cublasSgemm` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasSgemm` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 &alpha, a, m, b, k, &beta, c, m));

This exact expression `&alpha, a, m, b, k, &beta, c, m));` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `&alpha, a, m, b, k, &beta, c, m));` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 CHECK_CUDA(cudaDeviceSynchronize());

This line invokes the call chain `CHECK_CUDA → cudaDeviceSynchronize` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaDeviceSynchronize` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 CHECK_BLAS(cublasDestroy(blas));

This line invokes the call chain `CHECK_BLAS → cublasDestroy` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 cublasLtHandle_t lt{};

This exact expression `cublasLtHandle_t lt{};` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasLtHandle_t lt{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 cublasLtMatmulDesc_t operation{};

This exact expression `cublasLtMatmulDesc_t operation{};` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasLtMatmulDesc_t operation{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 cublasLtMatrixLayout_t a_layout{}, b_layout{}, c_layout{};

This exact expression `cublasLtMatrixLayout_t a_layout{}, b_layout{}, c_layout{};` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasLtMatrixLayout_t a_layout{}, b_layout{}, c_layout{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 cublasLtMatmulPreference_t preference{};

This exact expression `cublasLtMatmulPreference_t preference{};` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasLtMatmulPreference_t preference{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 CHECK_BLAS(cublasLtCreate(&lt));

This line invokes the call chain `CHECK_BLAS → cublasLtCreate` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 CHECK_BLAS(cublasLtMatmulDescCreate(&operation, CUBLAS_COMPUTE_32F, CUDA_R_32F));

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulDescCreate` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulDescCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 CHECK_BLAS(cublasLtMatrixLayoutCreate(&a_layout, CUDA_R_32F, m, k, m));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutCreate` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 CHECK_BLAS(cublasLtMatrixLayoutCreate(&b_layout, CUDA_R_32F, k, n, k));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutCreate` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 CHECK_BLAS(cublasLtMatrixLayoutCreate(&c_layout, CUDA_R_32F, m, n, m));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutCreate` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 CHECK_BLAS(cublasLtMatmulPreferenceCreate(&preference));

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulPreferenceCreate` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulPreferenceCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 constexpr size_t workspace_bytes = 4 << 20;

This line binds or updates `workspace_bytes = 4 << 20` for later source in cuBLASLt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `workspace_bytes = 4 << 20` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 void* workspace = nullptr;

This line binds or updates `workspace = nullptr` for later source in cuBLASLt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `workspace = nullptr` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 CHECK_CUDA(cudaMalloc(&workspace, workspace_bytes));

This line invokes the call chain `CHECK_CUDA → cudaMalloc` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaMalloc` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 CHECK_BLAS(cublasLtMatmulPreferenceSetAttribute(

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulPreferenceSetAttribute` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulPreferenceSetAttribute` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 preference, CUBLASLT_MATMUL_PREF_MAX_WORKSPACE_BYTES,

This exact expression `preference, CUBLASLT_MATMUL_PREF_MAX_WORKSPACE_BYTES,` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `preference, CUBLASLT_MATMUL_PREF_MAX_WORKSPACE_BYTES,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 &workspace_bytes, sizeof(workspace_bytes)));

This line invokes the call chain `sizeof` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `sizeof` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 cublasLtMatmulHeuristicResult_t heuristic{};

This exact expression `cublasLtMatmulHeuristicResult_t heuristic{};` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublasLtMatmulHeuristicResult_t heuristic{};` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 int returned = 0;

This line binds or updates `returned = 0` for later source in cuBLASLt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `returned = 0` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 CHECK_BLAS(cublasLtMatmulAlgoGetHeuristic(

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulAlgoGetHeuristic` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulAlgoGetHeuristic` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 lt, operation, a_layout, b_layout, c_layout, c_layout,

This exact expression `lt, operation, a_layout, b_layout, c_layout, c_layout,` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `lt, operation, a_layout, b_layout, c_layout, c_layout,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 preference, 1, &heuristic, &returned));

This exact expression `preference, 1, &heuristic, &returned));` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `preference, 1, &heuristic, &returned));` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 if (returned == 0) {

This line selects a control path using `if (returned == 0) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if (returned == 0) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 std::fprintf(stderr, "no cuBLASLt heuristic\n");

This continuation line declares or passes `std::fprintf(stderr, "no cuBLASLt heuristic\n");` as part of the surrounding call or signature in cuBLASLt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `std::fprintf(stderr, "no cuBLASLt heuristic\n");` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 return 4;

This line returns `return 4;` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return 4;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 CHECK_BLAS(cublasLtMatmul(

This line invokes the call chain `CHECK_BLAS → cublasLtMatmul` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmul` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 lt, operation, &alpha, a, a_layout, b, b_layout, &beta, c, c_layout,

This exact expression `lt, operation, &alpha, a, a_layout, b, b_layout, &beta, c, c_layout,` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `lt, operation, &alpha, a, a_layout, b, b_layout, &beta, c, c_layout,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 c, c_layout, &heuristic.algo, workspace, workspace_bytes, nullptr));

This exact expression `c, c_layout, &heuristic.algo, workspace, workspace_bytes, nullptr));` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `c, c_layout, &heuristic.algo, workspace, workspace_bytes, nullptr));` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 CHECK_CUDA(cudaDeviceSynchronize());

This line invokes the call chain `CHECK_CUDA → cudaDeviceSynchronize` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaDeviceSynchronize` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E61 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E62 std::printf("cublas_baseline=ok cublaslt_heuristic=ok workspace_bytes=%zu\n",

This line binds or updates `cublaslt_heuristic = ok workspace_bytes=%zu\n",` for later source in cuBLASLt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cublaslt_heuristic = ok workspace_bytes=%zu\n",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E63 workspace_bytes);

This exact expression `workspace_bytes);` contributes to the surrounding cuBLASLt statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `workspace_bytes);` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E64 CHECK_CUDA(cudaFree(workspace));

This line invokes the call chain `CHECK_CUDA → cudaFree` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaFree` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E65 CHECK_BLAS(cublasLtMatmulPreferenceDestroy(preference));

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulPreferenceDestroy` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulPreferenceDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E66 CHECK_BLAS(cublasLtMatrixLayoutDestroy(c_layout));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutDestroy` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E67 CHECK_BLAS(cublasLtMatrixLayoutDestroy(b_layout));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutDestroy` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E68 CHECK_BLAS(cublasLtMatrixLayoutDestroy(a_layout));

This line invokes the call chain `CHECK_BLAS → cublasLtMatrixLayoutDestroy` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatrixLayoutDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E69 CHECK_BLAS(cublasLtMatmulDescDestroy(operation));

This line invokes the call chain `CHECK_BLAS → cublasLtMatmulDescDestroy` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtMatmulDescDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E70 CHECK_BLAS(cublasLtDestroy(lt));

This line invokes the call chain `CHECK_BLAS → cublasLtDestroy` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_BLAS → cublasLtDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E71 CHECK_CUDA(cudaFree(c));

This line invokes the call chain `CHECK_CUDA → cudaFree` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaFree` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E72 CHECK_CUDA(cudaFree(b));

This line invokes the call chain `CHECK_CUDA → cudaFree` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaFree` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E73 CHECK_CUDA(cudaFree(a));

This line invokes the call chain `CHECK_CUDA → cudaFree` when cuBLASLt executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CHECK_CUDA → cudaFree` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E74 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E75 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 75 Read this exact line
#include <cublasLt.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cublasLt.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/03-kernels/gemm_paths.cu

Revision: not supplied

shared operator cuda coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is math_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cutlass CUTLASS 34 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUTLASS

bash

REGISTERED SOURCE · 34 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/03-kernels/vendor_kernel_paths.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # Pin source trees before running. These commands demonstrate reproducible
     E05  # entry points while leaving tactic choice and architecture selection to the
     E06  # detected target and pinned release.
     E07
     E08  : "${CUTLASS_SRC:=}"
     E09  : "${CUDNN_FRONTEND_SRC:=}"
     E10
     E11  if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then
     E12    git -C "$CUTLASS_SRC" rev-parse HEAD
     E13    test -f "$CUTLASS_SRC/examples/00_basic_gemm/basic_gemm.cu"
     E14    test -d "$CUTLASS_SRC/python/CuTeDSL"
     E15  else
     E16    echo "CUTLASS_SRC not set; pin NVIDIA/cutlass v4.5.3 or an explicit commit"
     E17  fi
     E18
     E19  if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then
     E20    git -C "$CUDNN_FRONTEND_SRC" rev-parse HEAD
     E21  else
     E22    echo "CUDNN_FRONTEND_SRC not set; pin NVIDIA/cudnn-frontend v1.26.0"
     E23  fi
     E24
     E25  python3 - <<'PY'
     E26  import importlib.metadata as metadata
     E27
     E28  for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):
     E29      try:
     E30          print(f"{package}={metadata.version(package)}")
     E31      except metadata.PackageNotFoundError:
     E32          print(f"{package}=missing")
     E33  PY
     E34  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 34 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `/usr/bin/env bash` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Pin source trees before running. These commands demonstrate reproducible

This comment documents `Pin source trees before running. These commands demonstrate reproducible` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # entry points while leaving tactic choice and architecture selection to the

This comment documents `entry points while leaving tactic choice and architecture selection to the` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 # detected target and pinned release.

This comment documents `detected target and pinned release.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 : "${CUTLASS_SRC:=}"

This exact expression `: "${CUTLASS_SRC:=}"` contributes to the surrounding CUTLASS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `: "${CUTLASS_SRC:=}"` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 : "${CUDNN_FRONTEND_SRC:=}"

This exact expression `: "${CUDNN_FRONTEND_SRC:=}"` contributes to the surrounding CUTLASS statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `: "${CUDNN_FRONTEND_SRC:=}"` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then

This line selects a control path using `if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 git -C "$CUTLASS_SRC" rev-parse HEAD

This line invokes `git` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `git` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 test -f "$CUTLASS_SRC/examples/00_basic_gemm/basic_gemm.cu"

This line invokes `test` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 test -d "$CUTLASS_SRC/python/CuTeDSL"

This line invokes `test` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `else` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 echo "CUTLASS_SRC not set; pin NVIDIA/cutlass v4.5.3 or an explicit commit"

This line invokes `echo` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 fi

This line invokes `fi` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then

This line selects a control path using `if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 git -C "$CUDNN_FRONTEND_SRC" rev-parse HEAD

This line invokes `git` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `git` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `else` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 echo "CUDNN_FRONTEND_SRC not set; pin NVIDIA/cudnn-frontend v1.26.0"

This line invokes `echo` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 fi

This line invokes `fi` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 python3 - <<'PY'

This line invokes `python3` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import importlib.metadata as metadata` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):

This line begins the repeated control path `for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):` inside CUTLASS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 try:

This line invokes `try:` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 print(f"{package}={metadata.version(package)}")

This line invokes `print(f"{package}={metadata.version(package)}")` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 except metadata.PackageNotFoundError:

This line invokes `except` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 print(f"{package}=missing")

This line invokes `print(f"{package}=missing")` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}=missing")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 PY

This line invokes `PY` in the CUTLASS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 34 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/03-kernels/vendor_kernel_paths.sh

Revision: not supplied

shared kernel bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is kernel_library.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cute-dsl CuTe and CuTe DSL 34 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CuTe and CuTe DSL

bash

REGISTERED SOURCE · 34 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/03-kernels/vendor_kernel_paths.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # Pin source trees before running. These commands demonstrate reproducible
     E05  # entry points while leaving tactic choice and architecture selection to the
     E06  # detected target and pinned release.
     E07
     E08  : "${CUTLASS_SRC:=}"
     E09  : "${CUDNN_FRONTEND_SRC:=}"
     E10
     E11  if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then
     E12    git -C "$CUTLASS_SRC" rev-parse HEAD
     E13    test -f "$CUTLASS_SRC/examples/00_basic_gemm/basic_gemm.cu"
     E14    test -d "$CUTLASS_SRC/python/CuTeDSL"
     E15  else
     E16    echo "CUTLASS_SRC not set; pin NVIDIA/cutlass v4.5.3 or an explicit commit"
     E17  fi
     E18
     E19  if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then
     E20    git -C "$CUDNN_FRONTEND_SRC" rev-parse HEAD
     E21  else
     E22    echo "CUDNN_FRONTEND_SRC not set; pin NVIDIA/cudnn-frontend v1.26.0"
     E23  fi
     E24
     E25  python3 - <<'PY'
     E26  import importlib.metadata as metadata
     E27
     E28  for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):
     E29      try:
     E30          print(f"{package}={metadata.version(package)}")
     E31      except metadata.PackageNotFoundError:
     E32          print(f"{package}=missing")
     E33  PY
     E34  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 34 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `/usr/bin/env bash` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Pin source trees before running. These commands demonstrate reproducible

This comment documents `Pin source trees before running. These commands demonstrate reproducible` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # entry points while leaving tactic choice and architecture selection to the

This comment documents `entry points while leaving tactic choice and architecture selection to the` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 # detected target and pinned release.

This comment documents `detected target and pinned release.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 : "${CUTLASS_SRC:=}"

This exact expression `: "${CUTLASS_SRC:=}"` contributes to the surrounding CuTe and CuTe DSL statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `: "${CUTLASS_SRC:=}"` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 : "${CUDNN_FRONTEND_SRC:=}"

This exact expression `: "${CUDNN_FRONTEND_SRC:=}"` contributes to the surrounding CuTe and CuTe DSL statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `: "${CUDNN_FRONTEND_SRC:=}"` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then

This line selects a control path using `if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 git -C "$CUTLASS_SRC" rev-parse HEAD

This line invokes `git` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `git` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 test -f "$CUTLASS_SRC/examples/00_basic_gemm/basic_gemm.cu"

This line invokes `test` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 test -d "$CUTLASS_SRC/python/CuTeDSL"

This line invokes `test` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `else` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 echo "CUTLASS_SRC not set; pin NVIDIA/cutlass v4.5.3 or an explicit commit"

This line invokes `echo` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 fi

This line invokes `fi` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then

This line selects a control path using `if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 git -C "$CUDNN_FRONTEND_SRC" rev-parse HEAD

This line invokes `git` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `git` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `else` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 echo "CUDNN_FRONTEND_SRC not set; pin NVIDIA/cudnn-frontend v1.26.0"

This line invokes `echo` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 fi

This line invokes `fi` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 python3 - <<'PY'

This line invokes `python3` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import importlib.metadata as metadata` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):

This line begins the repeated control path `for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):` inside CuTe and CuTe DSL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 try:

This line invokes `try:` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 print(f"{package}={metadata.version(package)}")

This line invokes `print(f"{package}={metadata.version(package)}")` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 except metadata.PackageNotFoundError:

This line invokes `except` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 print(f"{package}=missing")

This line invokes `print(f"{package}=missing")` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}=missing")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 PY

This line invokes `PY` in the CuTe and CuTe DSL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 34 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/03-kernels/vendor_kernel_paths.sh

Revision: not supplied

shared kernel bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is kernel_dsl.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

transformer-engine Transformer Engine 69 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Transformer Engine

python

REGISTERED SOURCE · 69 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/03-kernels/precision_paths.py

     E01  #!/usr/bin/env python3
     E02  """Small FP8 and quantization preparation probes.
     E03
     E04  The Model Optimizer route is opt-in because calibration changes model state.
     E05  Neither branch exports or claims a GLM-5.2 artifact.
     E06  """
     E07
     E08  from __future__ import annotations
     E09
     E10  import argparse
     E11  import json
     E12
     E13  import torch
     E14
     E15
     E16  def transformer_engine_probe() -> dict[str, object]:
     E17      import transformer_engine.pytorch as te
     E18      from transformer_engine.common.recipe import DelayedScaling
     E19
     E20      layer = te.Linear(128, 128, bias=False).cuda().eval()
     E21      x = torch.randn(16, 128, device="cuda", dtype=torch.float16)
     E22      with torch.no_grad(), te.fp8_autocast(enabled=True, fp8_recipe=DelayedScaling()):
     E23          output = layer(x)
     E24      return {"shape": list(output.shape), "dtype": str(output.dtype)}
     E25
     E26
     E27  def model_optimizer_probe(execute: bool) -> dict[str, object]:
     E28      import modelopt.torch.quantization as mtq
     E29
     E30      result: dict[str, object] = {
     E31          "config": "NVFP4_DEFAULT_CFG",
     E32          "execute": execute,
     E33          "warning": "preparation_only_not_a_glm_5_2_export",
     E34      }
     E35      if not execute:
     E36          return result
     E37
     E38      model = torch.nn.Linear(128, 128, bias=False).cuda().eval()
     E39
     E40      def forward_loop(candidate: torch.nn.Module) -> None:
     E41          with torch.no_grad():
     E42              for _ in range(4):
     E43                  candidate(torch.randn(8, 128, device="cuda"))
     E44
     E45      mtq.quantize(model, mtq.NVFP4_DEFAULT_CFG, forward_loop=forward_loop)
     E46      result["quantized"] = True
     E47      return result
     E48
     E49
     E50  def main() -> None:
     E51      parser = argparse.ArgumentParser()
     E52      parser.add_argument("--execute-modelopt", action="store_true")
     E53      args = parser.parse_args()
     E54      if not torch.cuda.is_available():
     E55          raise SystemExit("CUDA GPU required")
     E56      print(
     E57          json.dumps(
     E58              {
     E59                  "transformer_engine": transformer_engine_probe(),
     E60                  "model_optimizer": model_optimizer_probe(args.execute_modelopt),
     E61              },
     E62              indent=2,
     E63          )
     E64      )
     E65
     E66
     E67  if __name__ == "__main__":
     E68      main()
     E69  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 69 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """Small FP8 and quantization preparation probes.

This documentation line explains `Small FP8 and quantization preparation probes.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 The Model Optimizer route is opt-in because calibration changes model state.

This exact expression `The Model Optimizer route is opt-in because calibration changes model state.` contributes to the surrounding Transformer Engine statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `The Model Optimizer route is opt-in because calibration changes model state.` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 Neither branch exports or claims a GLM-5.2 artifact.

This exact expression `Neither branch exports or claims a GLM-5.2 artifact.` contributes to the surrounding Transformer Engine statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `Neither branch exports or claims a GLM-5.2 artifact.` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 """

This documentation line explains ``; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 from __future__ import annotations

This line imports `from __future__ import annotations` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `from __future__ import annotations` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 import argparse

This line imports `import argparse` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import argparse` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 import json

This line imports `import json` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import json` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 import torch

This line imports `import torch` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import torch` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 def transformer_engine_probe() -> dict[str, object]:

This line begins the `transformer_engine_probe` callable contract used by Transformer Engine; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `transformer_engine_probe` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 import transformer_engine.pytorch as te

This line imports `import transformer_engine.pytorch as te` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import transformer_engine.pytorch as te` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 from transformer_engine.common.recipe import DelayedScaling

This line imports `from transformer_engine.common.recipe import DelayedScaling` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `from transformer_engine.common.recipe import DelayedScaling` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 layer = te.Linear(128, 128, bias=False).cuda().eval()

This line calls `te.Linear(...)` and binds its returned value to `layer` for later use in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `layer ← te.Linear(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 x = torch.randn(16, 128, device="cuda", dtype=torch.float16)

This line calls `torch.randn(...)` and binds its returned value to `x` for later use in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `x ← torch.randn(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 with torch.no_grad(), te.fp8_autocast(enabled=True, fp8_recipe=DelayedScaling()):

This line calls `DelayedScaling(...)` and binds its returned value to `fp8_recipe` for later use in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `fp8_recipe ← DelayedScaling(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 output = layer(x)

This line calls `layer(...)` and binds its returned value to `output` for later use in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `output ← layer(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 return {"shape": list(output.shape), "dtype": str(output.dtype)}

This line returns `return {"shape": list(output.shape), "dtype": str(output.dtype)}` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return {"shape": list(output.shape), "dtype": str(output.dtype)}` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 def model_optimizer_probe(execute: bool) -> dict[str, object]:

This line begins the `model_optimizer_probe` callable contract used by Transformer Engine; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `model_optimizer_probe` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 import modelopt.torch.quantization as mtq

This line imports `import modelopt.torch.quantization as mtq` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import modelopt.torch.quantization as mtq` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 result: dict[str, object] = {

This line binds or updates `object] = {` for later source in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `object] = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 "config": "NVFP4_DEFAULT_CFG",

This line declares `config = "NVFP4_DEFAULT_CFG"` as an exact configuration value used by Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `config = "NVFP4_DEFAULT_CFG"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 "execute": execute,

This line declares `execute = execute` as an exact configuration value used by Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `execute = execute` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 "warning": "preparation_only_not_a_glm_5_2_export",

This line declares `warning = "preparation_only_not_a_glm_5_2_export"` as an exact configuration value used by Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `warning = "preparation_only_not_a_glm_5_2_export"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 if not execute:

This line selects a control path using `if not execute:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if not execute:` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 return result

This line returns `return result` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return result` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 model = torch.nn.Linear(128, 128, bias=False).cuda().eval()

This line calls `torch.nn.Linear(...)` and binds its returned value to `model` for later use in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `model ← torch.nn.Linear(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 def forward_loop(candidate: torch.nn.Module) -> None:

This line begins the `forward_loop` callable contract used by Transformer Engine; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `forward_loop` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 with torch.no_grad():

This line invokes the call chain `torch.no_grad` when Transformer Engine executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `torch.no_grad` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 for _ in range(4):

This line begins the repeated control path `for _ in range(4):` inside Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for _ in range(4):` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 candidate(torch.randn(8, 128, device="cuda"))

This line binds or updates `device = "cuda"))` for later source in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `device = "cuda"))` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 mtq.quantize(model, mtq.NVFP4_DEFAULT_CFG, forward_loop=forward_loop)

This line binds or updates `forward_loop = forward_loop)` for later source in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `forward_loop = forward_loop)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 result["quantized"] = True

This exact expression `result["quantized"] = True` contributes to the surrounding Transformer Engine statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `result["quantized"] = True` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 return result

This line returns `return result` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return result` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 def main() -> None:

This line begins the `main` callable contract used by Transformer Engine; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 parser = argparse.ArgumentParser()

This line calls `argparse.ArgumentParser(...)` and binds its returned value to `parser` for later use in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `parser ← argparse.ArgumentParser(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 parser.add_argument("--execute-modelopt", action="store_true")

This line binds or updates `action = "store_true")` for later source in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `action = "store_true")` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 args = parser.parse_args()

This line calls `parser.parse_args(...)` and binds its returned value to `args` for later use in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `args ← parser.parse_args(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 if not torch.cuda.is_available():

This line selects a control path using `if not torch.cuda.is_available():` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if not torch.cuda.is_available():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 raise SystemExit("CUDA GPU required")

This line enforces `raise SystemExit("CUDA GPU required")` and stops or rejects the path when the condition fails. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `raise SystemExit("CUDA GPU required")` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 print(

This line invokes the call chain `print` when Transformer Engine executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `print` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 json.dumps(

This line invokes the call chain `json.dumps` when Transformer Engine executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `json.dumps` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 {

This exact expression `{` contributes to the surrounding Transformer Engine statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `{` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 "transformer_engine": transformer_engine_probe(),

This line declares `transformer_engine = transformer_engine_probe()` as an exact configuration value used by Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `transformer_engine = transformer_engine_probe()` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 "model_optimizer": model_optimizer_probe(args.execute_modelopt),

This line declares `model_optimizer = model_optimizer_probe(args.execute_modelopt)` as an exact configuration value used by Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `model_optimizer = model_optimizer_probe(args.execute_modelopt)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E61 },

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E62 indent=2,

This line binds or updates `indent = 2,` for later source in Transformer Engine. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `indent = 2,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E63 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E64 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E65 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E66 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E67 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if __name__ == "__main__":` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E68 main()

This line invokes the call chain `main` when Transformer Engine executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E69 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 69 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/03-kernels/precision_paths.py

Revision: not supplied

shared operator python coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is precision_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

model-optimizer NVIDIA Model Optimizer 69 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVIDIA Model Optimizer

python

REGISTERED SOURCE · 69 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/03-kernels/precision_paths.py

     E01  #!/usr/bin/env python3
     E02  """Small FP8 and quantization preparation probes.
     E03
     E04  The Model Optimizer route is opt-in because calibration changes model state.
     E05  Neither branch exports or claims a GLM-5.2 artifact.
     E06  """
     E07
     E08  from __future__ import annotations
     E09
     E10  import argparse
     E11  import json
     E12
     E13  import torch
     E14
     E15
     E16  def transformer_engine_probe() -> dict[str, object]:
     E17      import transformer_engine.pytorch as te
     E18      from transformer_engine.common.recipe import DelayedScaling
     E19
     E20      layer = te.Linear(128, 128, bias=False).cuda().eval()
     E21      x = torch.randn(16, 128, device="cuda", dtype=torch.float16)
     E22      with torch.no_grad(), te.fp8_autocast(enabled=True, fp8_recipe=DelayedScaling()):
     E23          output = layer(x)
     E24      return {"shape": list(output.shape), "dtype": str(output.dtype)}
     E25
     E26
     E27  def model_optimizer_probe(execute: bool) -> dict[str, object]:
     E28      import modelopt.torch.quantization as mtq
     E29
     E30      result: dict[str, object] = {
     E31          "config": "NVFP4_DEFAULT_CFG",
     E32          "execute": execute,
     E33          "warning": "preparation_only_not_a_glm_5_2_export",
     E34      }
     E35      if not execute:
     E36          return result
     E37
     E38      model = torch.nn.Linear(128, 128, bias=False).cuda().eval()
     E39
     E40      def forward_loop(candidate: torch.nn.Module) -> None:
     E41          with torch.no_grad():
     E42              for _ in range(4):
     E43                  candidate(torch.randn(8, 128, device="cuda"))
     E44
     E45      mtq.quantize(model, mtq.NVFP4_DEFAULT_CFG, forward_loop=forward_loop)
     E46      result["quantized"] = True
     E47      return result
     E48
     E49
     E50  def main() -> None:
     E51      parser = argparse.ArgumentParser()
     E52      parser.add_argument("--execute-modelopt", action="store_true")
     E53      args = parser.parse_args()
     E54      if not torch.cuda.is_available():
     E55          raise SystemExit("CUDA GPU required")
     E56      print(
     E57          json.dumps(
     E58              {
     E59                  "transformer_engine": transformer_engine_probe(),
     E60                  "model_optimizer": model_optimizer_probe(args.execute_modelopt),
     E61              },
     E62              indent=2,
     E63          )
     E64      )
     E65
     E66
     E67  if __name__ == "__main__":
     E68      main()
     E69  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 69 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """Small FP8 and quantization preparation probes.

This documentation line explains `Small FP8 and quantization preparation probes.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 The Model Optimizer route is opt-in because calibration changes model state.

This exact expression `The Model Optimizer route is opt-in because calibration changes model state.` contributes to the surrounding NVIDIA Model Optimizer statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `The Model Optimizer route is opt-in because calibration changes model state.` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 Neither branch exports or claims a GLM-5.2 artifact.

This exact expression `Neither branch exports or claims a GLM-5.2 artifact.` contributes to the surrounding NVIDIA Model Optimizer statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `Neither branch exports or claims a GLM-5.2 artifact.` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 """

This documentation line explains ``; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 from __future__ import annotations

This line imports `from __future__ import annotations` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `from __future__ import annotations` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 import argparse

This line imports `import argparse` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import argparse` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 import json

This line imports `import json` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import json` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 import torch

This line imports `import torch` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import torch` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 def transformer_engine_probe() -> dict[str, object]:

This line begins the `transformer_engine_probe` callable contract used by NVIDIA Model Optimizer; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `transformer_engine_probe` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 import transformer_engine.pytorch as te

This line imports `import transformer_engine.pytorch as te` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import transformer_engine.pytorch as te` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 from transformer_engine.common.recipe import DelayedScaling

This line imports `from transformer_engine.common.recipe import DelayedScaling` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `from transformer_engine.common.recipe import DelayedScaling` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 layer = te.Linear(128, 128, bias=False).cuda().eval()

This line calls `te.Linear(...)` and binds its returned value to `layer` for later use in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `layer ← te.Linear(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 x = torch.randn(16, 128, device="cuda", dtype=torch.float16)

This line calls `torch.randn(...)` and binds its returned value to `x` for later use in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `x ← torch.randn(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 with torch.no_grad(), te.fp8_autocast(enabled=True, fp8_recipe=DelayedScaling()):

This line calls `DelayedScaling(...)` and binds its returned value to `fp8_recipe` for later use in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `fp8_recipe ← DelayedScaling(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 output = layer(x)

This line calls `layer(...)` and binds its returned value to `output` for later use in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `output ← layer(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 return {"shape": list(output.shape), "dtype": str(output.dtype)}

This line returns `return {"shape": list(output.shape), "dtype": str(output.dtype)}` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `return {"shape": list(output.shape), "dtype": str(output.dtype)}` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 def model_optimizer_probe(execute: bool) -> dict[str, object]:

This line begins the `model_optimizer_probe` callable contract used by NVIDIA Model Optimizer; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `model_optimizer_probe` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 import modelopt.torch.quantization as mtq

This line imports `import modelopt.torch.quantization as mtq` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import modelopt.torch.quantization as mtq` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 result: dict[str, object] = {

This line binds or updates `object] = {` for later source in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `object] = {` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 "config": "NVFP4_DEFAULT_CFG",

This line declares `config = "NVFP4_DEFAULT_CFG"` as an exact configuration value used by NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `config = "NVFP4_DEFAULT_CFG"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 "execute": execute,

This line declares `execute = execute` as an exact configuration value used by NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `execute = execute` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 "warning": "preparation_only_not_a_glm_5_2_export",

This line declares `warning = "preparation_only_not_a_glm_5_2_export"` as an exact configuration value used by NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `warning = "preparation_only_not_a_glm_5_2_export"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 if not execute:

This line selects a control path using `if not execute:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if not execute:` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 return result

This line returns `return result` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `return result` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 model = torch.nn.Linear(128, 128, bias=False).cuda().eval()

This line calls `torch.nn.Linear(...)` and binds its returned value to `model` for later use in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `model ← torch.nn.Linear(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 def forward_loop(candidate: torch.nn.Module) -> None:

This line begins the `forward_loop` callable contract used by NVIDIA Model Optimizer; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `forward_loop` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 with torch.no_grad():

This line invokes the call chain `torch.no_grad` when NVIDIA Model Optimizer executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `torch.no_grad` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 for _ in range(4):

This line begins the repeated control path `for _ in range(4):` inside NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `for _ in range(4):` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 candidate(torch.randn(8, 128, device="cuda"))

This line binds or updates `device = "cuda"))` for later source in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `device = "cuda"))` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 mtq.quantize(model, mtq.NVFP4_DEFAULT_CFG, forward_loop=forward_loop)

This line binds or updates `forward_loop = forward_loop)` for later source in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `forward_loop = forward_loop)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 result["quantized"] = True

This exact expression `result["quantized"] = True` contributes to the surrounding NVIDIA Model Optimizer statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `result["quantized"] = True` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 return result

This line returns `return result` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `return result` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 def main() -> None:

This line begins the `main` callable contract used by NVIDIA Model Optimizer; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `main` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 parser = argparse.ArgumentParser()

This line calls `argparse.ArgumentParser(...)` and binds its returned value to `parser` for later use in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `parser ← argparse.ArgumentParser(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 parser.add_argument("--execute-modelopt", action="store_true")

This line binds or updates `action = "store_true")` for later source in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `action = "store_true")` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 args = parser.parse_args()

This line calls `parser.parse_args(...)` and binds its returned value to `args` for later use in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `args ← parser.parse_args(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 if not torch.cuda.is_available():

This line selects a control path using `if not torch.cuda.is_available():` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if not torch.cuda.is_available():` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 raise SystemExit("CUDA GPU required")

This line enforces `raise SystemExit("CUDA GPU required")` and stops or rejects the path when the condition fails. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `raise SystemExit("CUDA GPU required")` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 print(

This line invokes the call chain `print` when NVIDIA Model Optimizer executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `print` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 json.dumps(

This line invokes the call chain `json.dumps` when NVIDIA Model Optimizer executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `json.dumps` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 {

This exact expression `{` contributes to the surrounding NVIDIA Model Optimizer statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `{` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 "transformer_engine": transformer_engine_probe(),

This line declares `transformer_engine = transformer_engine_probe()` as an exact configuration value used by NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `transformer_engine = transformer_engine_probe()` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 "model_optimizer": model_optimizer_probe(args.execute_modelopt),

This line declares `model_optimizer = model_optimizer_probe(args.execute_modelopt)` as an exact configuration value used by NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `model_optimizer = model_optimizer_probe(args.execute_modelopt)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E61 },

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E62 indent=2,

This line binds or updates `indent = 2,` for later source in NVIDIA Model Optimizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `indent = 2,` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E63 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E64 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E65 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E66 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E67 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if __name__ == "__main__":` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E68 main()

This line invokes the call chain `main` when NVIDIA Model Optimizer executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `main` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E69 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 69 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/03-kernels/precision_paths.py

Revision: not supplied

shared engine python coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is model_optimization.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cudnn cuDNN backend and frontend graph APIs 34 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuDNN backend and frontend graph APIs

bash

REGISTERED SOURCE · 34 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/03-kernels/vendor_kernel_paths.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # Pin source trees before running. These commands demonstrate reproducible
     E05  # entry points while leaving tactic choice and architecture selection to the
     E06  # detected target and pinned release.
     E07
     E08  : "${CUTLASS_SRC:=}"
     E09  : "${CUDNN_FRONTEND_SRC:=}"
     E10
     E11  if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then
     E12    git -C "$CUTLASS_SRC" rev-parse HEAD
     E13    test -f "$CUTLASS_SRC/examples/00_basic_gemm/basic_gemm.cu"
     E14    test -d "$CUTLASS_SRC/python/CuTeDSL"
     E15  else
     E16    echo "CUTLASS_SRC not set; pin NVIDIA/cutlass v4.5.3 or an explicit commit"
     E17  fi
     E18
     E19  if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then
     E20    git -C "$CUDNN_FRONTEND_SRC" rev-parse HEAD
     E21  else
     E22    echo "CUDNN_FRONTEND_SRC not set; pin NVIDIA/cudnn-frontend v1.26.0"
     E23  fi
     E24
     E25  python3 - <<'PY'
     E26  import importlib.metadata as metadata
     E27
     E28  for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):
     E29      try:
     E30          print(f"{package}={metadata.version(package)}")
     E31      except metadata.PackageNotFoundError:
     E32          print(f"{package}=missing")
     E33  PY
     E34  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 34 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `/usr/bin/env bash` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Pin source trees before running. These commands demonstrate reproducible

This comment documents `Pin source trees before running. These commands demonstrate reproducible` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # entry points while leaving tactic choice and architecture selection to the

This comment documents `entry points while leaving tactic choice and architecture selection to the` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 # detected target and pinned release.

This comment documents `detected target and pinned release.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 : "${CUTLASS_SRC:=}"

This exact expression `: "${CUTLASS_SRC:=}"` contributes to the surrounding cuDNN backend and frontend graph APIs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `: "${CUTLASS_SRC:=}"` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 : "${CUDNN_FRONTEND_SRC:=}"

This exact expression `: "${CUDNN_FRONTEND_SRC:=}"` contributes to the surrounding cuDNN backend and frontend graph APIs statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `: "${CUDNN_FRONTEND_SRC:=}"` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then

This line selects a control path using `if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 git -C "$CUTLASS_SRC" rev-parse HEAD

This line invokes `git` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `git` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 test -f "$CUTLASS_SRC/examples/00_basic_gemm/basic_gemm.cu"

This line invokes `test` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 test -d "$CUTLASS_SRC/python/CuTeDSL"

This line invokes `test` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `else` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 echo "CUTLASS_SRC not set; pin NVIDIA/cutlass v4.5.3 or an explicit commit"

This line invokes `echo` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 fi

This line invokes `fi` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then

This line selects a control path using `if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 git -C "$CUDNN_FRONTEND_SRC" rev-parse HEAD

This line invokes `git` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `git` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `else` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 echo "CUDNN_FRONTEND_SRC not set; pin NVIDIA/cudnn-frontend v1.26.0"

This line invokes `echo` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 fi

This line invokes `fi` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 python3 - <<'PY'

This line invokes `python3` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `import importlib.metadata as metadata` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):

This line begins the repeated control path `for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):` inside cuDNN backend and frontend graph APIs. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 try:

This line invokes `try:` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 print(f"{package}={metadata.version(package)}")

This line invokes `print(f"{package}={metadata.version(package)}")` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 except metadata.PackageNotFoundError:

This line invokes `except` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 print(f"{package}=missing")

This line invokes `print(f"{package}=missing")` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}=missing")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 PY

This line invokes `PY` in the cuDNN backend and frontend graph APIs source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 34 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/03-kernels/vendor_kernel_paths.sh

Revision: not supplied

shared kernel bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is kernel_library.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

flashinfer FlashInfer 38 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

FlashInfer

python

REGISTERED SOURCE · 38 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/03-kernels/flashinfer_attention.py

     E01  #!/usr/bin/env python3
     E02  """FlashInfer 0.6.14 prefill/decode API probe with a PyTorch reference."""
     E03
     E04  from __future__ import annotations
     E05
     E06  import json
     E07
     E08  import torch
     E09  from flashinfer.decode import single_decode_with_kv_cache
     E10  from flashinfer.prefill import single_prefill_with_kv_cache
     E11
     E12
     E13  def main() -> None:
     E14      if not torch.cuda.is_available():
     E15          raise SystemExit("CUDA GPU required")
     E16      torch.manual_seed(7)
     E17      qo_len, kv_len, heads, head_dim = 8, 16, 8, 128
     E18      q = torch.randn(qo_len, heads, head_dim, device="cuda", dtype=torch.float16)
     E19      k = torch.randn(kv_len, heads, head_dim, device="cuda", dtype=torch.float16)
     E20      v = torch.randn_like(k)
     E21      prefill = single_prefill_with_kv_cache(q, k, v, causal=False, kv_layout="NHD")
     E22      decode = single_decode_with_kv_cache(q[-1], k, v, kv_layout="NHD")
     E23      print(
     E24          json.dumps(
     E25              {
     E26                  "prefill_shape": list(prefill.shape),
     E27                  "decode_shape": list(decode.shape),
     E28                  "dtype": str(prefill.dtype),
     E29                  "receipt_scope": "synthetic_attention_shapes_not_glm_5_2",
     E30              },
     E31              indent=2,
     E32          )
     E33      )
     E34
     E35
     E36  if __name__ == "__main__":
     E37      main()
     E38  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 38 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """FlashInfer 0.6.14 prefill/decode API probe with a PyTorch reference."""

This documentation line explains `FlashInfer 0.6.14 prefill/decode API probe with a PyTorch reference.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 from __future__ import annotations

This line imports `from __future__ import annotations` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `from __future__ import annotations` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 import json

This line imports `import json` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import json` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 import torch

This line imports `import torch` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import torch` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 from flashinfer.decode import single_decode_with_kv_cache

This line imports `from flashinfer.decode import single_decode_with_kv_cache` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `from flashinfer.decode import single_decode_with_kv_cache` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 from flashinfer.prefill import single_prefill_with_kv_cache

This line imports `from flashinfer.prefill import single_prefill_with_kv_cache` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `from flashinfer.prefill import single_prefill_with_kv_cache` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 def main() -> None:

This line begins the `main` callable contract used by FlashInfer; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 if not torch.cuda.is_available():

This line selects a control path using `if not torch.cuda.is_available():` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if not torch.cuda.is_available():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 raise SystemExit("CUDA GPU required")

This line enforces `raise SystemExit("CUDA GPU required")` and stops or rejects the path when the condition fails. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `raise SystemExit("CUDA GPU required")` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 torch.manual_seed(7)

This line invokes the call chain `torch.manual_seed` when FlashInfer executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `torch.manual_seed` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 qo_len, kv_len, heads, head_dim = 8, 16, 8, 128

This line binds or updates `head_dim = 8, 16, 8, 128` for later source in FlashInfer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `head_dim = 8, 16, 8, 128` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 q = torch.randn(qo_len, heads, head_dim, device="cuda", dtype=torch.float16)

This line calls `torch.randn(...)` and binds its returned value to `q` for later use in FlashInfer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `q ← torch.randn(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 k = torch.randn(kv_len, heads, head_dim, device="cuda", dtype=torch.float16)

This line calls `torch.randn(...)` and binds its returned value to `k` for later use in FlashInfer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `k ← torch.randn(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 v = torch.randn_like(k)

This line calls `torch.randn_like(...)` and binds its returned value to `v` for later use in FlashInfer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `v ← torch.randn_like(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 prefill = single_prefill_with_kv_cache(q, k, v, causal=False, kv_layout="NHD")

This line calls `single_prefill_with_kv_cache(...)` and binds its returned value to `prefill` for later use in FlashInfer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `prefill ← single_prefill_with_kv_cache(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 decode = single_decode_with_kv_cache(q[-1], k, v, kv_layout="NHD")

This line calls `single_decode_with_kv_cache(...)` and binds its returned value to `decode` for later use in FlashInfer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `decode ← single_decode_with_kv_cache(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 print(

This line invokes the call chain `print` when FlashInfer executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `print` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 json.dumps(

This line invokes the call chain `json.dumps` when FlashInfer executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `json.dumps` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 {

This exact expression `{` contributes to the surrounding FlashInfer statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `{` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 "prefill_shape": list(prefill.shape),

This line declares `prefill_shape = list(prefill.shape)` as an exact configuration value used by FlashInfer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `prefill_shape = list(prefill.shape)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 "decode_shape": list(decode.shape),

This line declares `decode_shape = list(decode.shape)` as an exact configuration value used by FlashInfer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `decode_shape = list(decode.shape)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 "dtype": str(prefill.dtype),

This line declares `dtype = str(prefill.dtype)` as an exact configuration value used by FlashInfer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `dtype = str(prefill.dtype)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 "receipt_scope": "synthetic_attention_shapes_not_glm_5_2",

This line declares `receipt_scope = "synthetic_attention_shapes_not_glm_5_2"` as an exact configuration value used by FlashInfer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `receipt_scope = "synthetic_attention_shapes_not_glm_5_2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Attention can read query/key/value or KV-cache state and write outputs; shape, backend, tiling, cache outcome, and observed HBM bytes are unknown.
Useful work / business implication
This line expresses or selects attention. Sequence length, head geometry, precision, KV-state placement, tiling, and fusion determine reads, writes, reuse, and latency. The accepted workload must preserve output quality while measuring the same context and cache policy.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 },

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 indent=2,

This line binds or updates `indent = 2,` for later source in FlashInfer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `indent = 2,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if __name__ == "__main__":` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 main()

This line invokes the call chain `main` when FlashInfer executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 38 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · FlashInfer Project

Source path: examples/hbm-learning-journey/nvidia/03-kernels/flashinfer_attention.py

Revision: not supplied

shared operator python coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is inference_kernel_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

triton-language Triton language and compiler 50 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Triton language and compiler

python

REGISTERED SOURCE · 50 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/03-kernels/pytorch_compile_triton.py

     E01  #!/usr/bin/env python3
     E02  """One operator expressed in PyTorch and Triton with a correctness receipt."""
     E03
     E04  from __future__ import annotations
     E05
     E06  import json
     E07
     E08  import torch
     E09  import triton
     E10  import triton.language as tl
     E11
     E12
     E13  @triton.jit
     E14  def add_kernel(x, y, output, n_elements: tl.constexpr, BLOCK: tl.constexpr):
     E15      offsets = tl.program_id(0) * BLOCK + tl.arange(0, BLOCK)
     E16      mask = offsets < n_elements
     E17      tl.store(output + offsets, tl.load(x + offsets, mask=mask) + tl.load(y + offsets, mask=mask), mask=mask)
     E18
     E19
     E20  def triton_add(x: torch.Tensor, y: torch.Tensor) -> torch.Tensor:
     E21      output = torch.empty_like(x)
     E22      grid = (triton.cdiv(x.numel(), 256),)
     E23      add_kernel[grid](x, y, output, x.numel(), BLOCK=256)
     E24      return output
     E25
     E26
     E27  def main() -> None:
     E28      if not torch.cuda.is_available():
     E29          raise SystemExit("CUDA GPU required")
     E30      x = torch.randn(1 << 20, device="cuda")
     E31      y = torch.randn_like(x)
     E32      reference = x + y
     E33      candidate = triton_add(x, y)
     E34      print(
     E35          json.dumps(
     E36              {
     E37                  "torch": torch.__version__,
     E38                  "triton": triton.__version__,
     E39                  "max_abs_error": float((reference - candidate).abs().max()),
     E40                  "matches": bool(torch.allclose(reference, candidate)),
     E41                  "receipt_scope": "toy_operator_not_glm_5_2",
     E42              },
     E43              indent=2,
     E44          )
     E45      )
     E46
     E47
     E48  if __name__ == "__main__":
     E49      main()
     E50  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 50 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """One operator expressed in PyTorch and Triton with a correctness receipt."""

This documentation line explains `One operator expressed in PyTorch and Triton with a correctness receipt.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 from __future__ import annotations

This line imports `from __future__ import annotations` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `from __future__ import annotations` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 import json

This line imports `import json` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import json` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 import torch

This line imports `import torch` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import torch` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 import triton

This line imports `import triton` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import triton` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 import triton.language as tl

This line imports `import triton.language as tl` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import triton.language as tl` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 @triton.jit

This line attaches `triton.jit` metadata or compilation behavior to the definition that follows. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `triton.jit` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line enters compilation, specialization, or search. It can trade build time and engineering complexity for fusion, fewer launches, better locality, or a faster executable. Compare compile cost, fallback behavior, correctness, and repeated accepted-task runtime.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 def add_kernel(x, y, output, n_elements: tl.constexpr, BLOCK: tl.constexpr):

This line begins the `add_kernel` callable contract used by Triton language and compiler; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `add_kernel` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 offsets = tl.program_id(0) * BLOCK + tl.arange(0, BLOCK)

This line calls `tl.program_id(...)` and binds its returned value to `offsets` for later use in Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `offsets ← tl.program_id(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 mask = offsets < n_elements

This line binds or updates `mask = offsets < n_elements` for later source in Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `mask = offsets < n_elements` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 tl.store(output + offsets, tl.load(x + offsets, mask=mask) + tl.load(y + offsets, mask=mask), mask=mask)

This line calls `tl.load(...)` and binds its returned value to `mask` for later use in Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `mask ← tl.load(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 def triton_add(x: torch.Tensor, y: torch.Tensor) -> torch.Tensor:

This line begins the `triton_add` callable contract used by Triton language and compiler; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `triton_add` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 output = torch.empty_like(x)

This line calls `torch.empty_like(...)` and binds its returned value to `output` for later use in Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `output ← torch.empty_like(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 grid = (triton.cdiv(x.numel(), 256),)

This line calls `triton.cdiv(...)` and binds its returned value to `grid` for later use in Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `grid ← triton.cdiv(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 add_kernel[grid](x, y, output, x.numel(), BLOCK=256)

This line binds or updates `BLOCK = 256)` for later source in Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `BLOCK = 256)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 return output

This line returns `return output` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return output` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 def main() -> None:

This line begins the `main` callable contract used by Triton language and compiler; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 if not torch.cuda.is_available():

This line selects a control path using `if not torch.cuda.is_available():` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if not torch.cuda.is_available():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 raise SystemExit("CUDA GPU required")

This line enforces `raise SystemExit("CUDA GPU required")` and stops or rejects the path when the condition fails. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `raise SystemExit("CUDA GPU required")` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 x = torch.randn(1 << 20, device="cuda")

This line calls `torch.randn(...)` and binds its returned value to `x` for later use in Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `x ← torch.randn(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 y = torch.randn_like(x)

This line calls `torch.randn_like(...)` and binds its returned value to `y` for later use in Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `y ← torch.randn_like(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 reference = x + y

This line binds or updates `reference = x + y` for later source in Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `reference = x + y` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 candidate = triton_add(x, y)

This line calls `triton_add(...)` and binds its returned value to `candidate` for later use in Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `candidate ← triton_add(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 print(

This line invokes the call chain `print` when Triton language and compiler executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `print` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 json.dumps(

This line invokes the call chain `json.dumps` when Triton language and compiler executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `json.dumps` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 {

This exact expression `{` contributes to the surrounding Triton language and compiler statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `{` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "torch": torch.__version__,

This line declares `torch = torch.__version__` as an exact configuration value used by Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `torch = torch.__version__` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "triton": triton.__version__,

This line declares `triton = triton.__version__` as an exact configuration value used by Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `triton = triton.__version__` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "max_abs_error": float((reference - candidate).abs().max()),

This line declares `max_abs_error = float((reference - candidate).abs().max())` as an exact configuration value used by Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `max_abs_error = float((reference - candidate).abs().max())` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 "matches": bool(torch.allclose(reference, candidate)),

This line declares `matches = bool(torch.allclose(reference, candidate))` as an exact configuration value used by Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `matches = bool(torch.allclose(reference, candidate))` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 "receipt_scope": "toy_operator_not_glm_5_2",

This line declares `receipt_scope = "toy_operator_not_glm_5_2"` as an exact configuration value used by Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `receipt_scope = "toy_operator_not_glm_5_2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 },

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 indent=2,

This line binds or updates `indent = 2,` for later source in Triton language and compiler. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `indent = 2,` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if __name__ == "__main__":` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 main()

This line invokes the call chain `main` when Triton language and compiler executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 50 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · Triton Project

Source path: examples/hbm-learning-journey/nvidia/03-kernels/pytorch_compile_triton.py

Revision: not supplied

shared operator python coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is kernel_dsl.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

custom-cuda Custom CUDA C++ kernel 7 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Custom CUDA C++ kernel

cuda

REGISTERED SOURCE · 7 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/02-runtime/kernel_only.cu

     E01  extern "C" __global__ void fill_kernel(float* out, int n, float value) {
     E02      const int i = blockIdx.x * blockDim.x + threadIdx.x;
     E03      if (i < n) {
     E04          out[i] = value;
     E05      }
     E06  }
     E07  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 7 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 extern "C" __global__ void fill_kernel(float* out, int n, float value) {

This signature line declares `value` as the value tensor combined with attention probabilities.

Source
The caller must supply the value tensor combined with attention probabilities.
Runtime / compiler
PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.
GPU execution
A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.
Useful work / business implication
This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 const int i = blockIdx.x * blockDim.x + threadIdx.x;

This line binds or updates `i = blockIdx.x * blockDim.x + threadIdx.x` for later source in Custom CUDA C++ kernel. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `i = blockIdx.x * blockDim.x + threadIdx.x` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 if (i < n) {

This line selects a control path using `if (i < n) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if (i < n) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 out[i] = value;

This line binds or updates `out[i] = value` for later source in Custom CUDA C++ kernel. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `out[i] = value` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 7 Read this exact line
extern "C" __global__ void fill_kernel(float* out, int n, float value) {
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This signature line declares `value` as the value tensor combined with attention probabilities.

What changes next in software

PyTorch passes the value through backend eligibility and dispatch checks when the operator is called.

What it means on the GPU

A function parameter does not select the final kernel, CTA, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Its runtime value can change tensor reads, masking, temporaries, or backend choice; actual addresses and HBM bytes require the call receipt.

Why this line could matter to useful work

This line initializes or overwrites storage. The requested size can create real memory traffic and startup latency, but completed bytes, cache behavior, and HBM traffic require a device dispatch and counters from the same interval.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · Touchdown Labs example using NVIDIA CUDA

Source path: examples/hbm-learning-journey/nvidia/02-runtime/kernel_only.cu

Revision: not supplied

shared operator cuda coverage: fixture_backed observation: supported evidence: illustrative
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is kernel.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

tensorrt-llm TensorRT-LLM 36 lines UNSUPPORTED FOR THIS TRACE

START HERE · SEE THE CODE FIRST

TensorRT-LLM

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # These are capability/configuration probes. They do not download weights and
     E05  # do not claim that GLM-5.2 is supported until the exact revision starts and
     E06  # completes the accepted-patch replay.
     E07
     E08  probe_module() {
     E09    local module="$1"
     E10    python3 - "$module" <<'PY'
     E11  import importlib.util
     E12  import sys
     E13
     E14  module = sys.argv[1]
     E15  print(f"{module}: {'installed' if importlib.util.find_spec(module) else 'missing'}")
     E16  PY
     E17  }
     E18
     E19  probe_module vllm
     E20  probe_module sglang
     E21  probe_module lmcache
     E22  probe_module tensorrt_llm
     E23  probe_module dynamo
     E24
     E25  command -v vllm >/dev/null && vllm --help | sed -n '1,35p' || true
     E26  command -v sglang >/dev/null && sglang --help | sed -n '1,35p' || true
     E27  command -v trtllm-serve >/dev/null && trtllm-serve --help | sed -n '1,35p' || true
     E28
     E29  cat <<'NOTE'
     E30  Reference launch surfaces only:
     E31    vLLM:            vllm serve <exact-model-revision> --enable-prefix-caching
     E32    SGLang/HiCache:  python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache
     E33    LMCache:         configure a named vLLM/SGLang connector version and prove lookup/store events
     E34    TensorRT-LLM:    trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `/usr/bin/env bash` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # These are capability/configuration probes. They do not download weights and

This comment documents `These are capability/configuration probes. They do not download weights and` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # do not claim that GLM-5.2 is supported until the exact revision starts and

This comment documents `do not claim that GLM-5.2 is supported until the exact revision starts and` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 # completes the accepted-patch replay.

This comment documents `completes the accepted-patch replay.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 probe_module() {

This line invokes `probe_module()` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 local module="$1"

This line binds or updates `module = "$1"` for later source in TensorRT-LLM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `module = "$1"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 python3 - "$module" <<'PY'

This line invokes `python3` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 import importlib.util

This line imports `import importlib.util` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import importlib.util` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 import sys

This line imports `import sys` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import sys` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 module = sys.argv[1]

This line binds or updates `module = sys.argv[1]` for later source in TensorRT-LLM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `module = sys.argv[1]` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 print(f"{module}: {'installed' if importlib.util.find_spec(module) else 'missing'}")

This line invokes `print(f"{module}:` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{module}:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 PY

This line invokes `PY` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_module vllm

This line invokes `probe_module` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_module sglang

This line invokes `probe_module` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_module lmcache

This line invokes `probe_module` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_module tensorrt_llm

This line invokes `probe_module` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_module dynamo

This line invokes `probe_module` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_module` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 command -v vllm >/dev/null && vllm --help | sed -n '1,35p' || true

This line invokes `command` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 command -v sglang >/dev/null && sglang --help | sed -n '1,35p' || true

This line invokes `command` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 command -v trtllm-serve >/dev/null && trtllm-serve --help | sed -n '1,35p' || true

This line invokes `command` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 cat <<'NOTE'

This line invokes `cat` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Reference launch surfaces only:

This line invokes `Reference` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Reference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line submits candidate device work. Launch count, geometry, dependency order, occupancy, and the selected executable can change latency and utilization, but submission is not proof that the intended kernel completed correctly.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 vLLM: vllm serve <exact-model-revision> --enable-prefix-caching

This line invokes `vLLM:` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `vLLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 SGLang/HiCache: python -m sglang.launch_server --model-path <exact-revision> --enable-hierarchical-cache

This line invokes `SGLang/HiCache:` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `SGLang/HiCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 LMCache: configure a named vLLM/SGLang connector version and prove lookup/store events

This line invokes `LMCache:` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `LMCache:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 TensorRT-LLM: trtllm-serve <artifact> only after the exact GLM-5.2 architecture is supported

This line invokes `TensorRT-LLM:` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `TensorRT-LLM:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the TensorRT-LLM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/01-framework/engine_paths.sh

Revision: not supplied

shared engine bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is inference_engine.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

tensorrt TensorRT 34 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

TensorRT

bash

REGISTERED SOURCE · 34 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/03-kernels/vendor_kernel_paths.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # Pin source trees before running. These commands demonstrate reproducible
     E05  # entry points while leaving tactic choice and architecture selection to the
     E06  # detected target and pinned release.
     E07
     E08  : "${CUTLASS_SRC:=}"
     E09  : "${CUDNN_FRONTEND_SRC:=}"
     E10
     E11  if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then
     E12    git -C "$CUTLASS_SRC" rev-parse HEAD
     E13    test -f "$CUTLASS_SRC/examples/00_basic_gemm/basic_gemm.cu"
     E14    test -d "$CUTLASS_SRC/python/CuTeDSL"
     E15  else
     E16    echo "CUTLASS_SRC not set; pin NVIDIA/cutlass v4.5.3 or an explicit commit"
     E17  fi
     E18
     E19  if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then
     E20    git -C "$CUDNN_FRONTEND_SRC" rev-parse HEAD
     E21  else
     E22    echo "CUDNN_FRONTEND_SRC not set; pin NVIDIA/cudnn-frontend v1.26.0"
     E23  fi
     E24
     E25  python3 - <<'PY'
     E26  import importlib.metadata as metadata
     E27
     E28  for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):
     E29      try:
     E30          print(f"{package}={metadata.version(package)}")
     E31      except metadata.PackageNotFoundError:
     E32          print(f"{package}=missing")
     E33  PY
     E34  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 34 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `/usr/bin/env bash` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Pin source trees before running. These commands demonstrate reproducible

This comment documents `Pin source trees before running. These commands demonstrate reproducible` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # entry points while leaving tactic choice and architecture selection to the

This comment documents `entry points while leaving tactic choice and architecture selection to the` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 # detected target and pinned release.

This comment documents `detected target and pinned release.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 : "${CUTLASS_SRC:=}"

This exact expression `: "${CUTLASS_SRC:=}"` contributes to the surrounding TensorRT statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `: "${CUTLASS_SRC:=}"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 : "${CUDNN_FRONTEND_SRC:=}"

This exact expression `: "${CUDNN_FRONTEND_SRC:=}"` contributes to the surrounding TensorRT statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `: "${CUDNN_FRONTEND_SRC:=}"` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then

This line selects a control path using `if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if [[ -n "$CUTLASS_SRC" && -d "$CUTLASS_SRC/.git" ]]; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 git -C "$CUTLASS_SRC" rev-parse HEAD

This line invokes `git` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `git` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 test -f "$CUTLASS_SRC/examples/00_basic_gemm/basic_gemm.cu"

This line invokes `test` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 test -d "$CUTLASS_SRC/python/CuTeDSL"

This line invokes `test` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `else` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 echo "CUTLASS_SRC not set; pin NVIDIA/cutlass v4.5.3 or an explicit commit"

This line invokes `echo` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 fi

This line invokes `fi` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then

This line selects a control path using `if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if [[ -n "$CUDNN_FRONTEND_SRC" && -d "$CUDNN_FRONTEND_SRC/.git" ]]; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 git -C "$CUDNN_FRONTEND_SRC" rev-parse HEAD

This line invokes `git` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `git` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `else` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 echo "CUDNN_FRONTEND_SRC not set; pin NVIDIA/cudnn-frontend v1.26.0"

This line invokes `echo` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 fi

This line invokes `fi` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 python3 - <<'PY'

This line invokes `python3` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import importlib.metadata as metadata` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):

This line begins the repeated control path `for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):` inside TensorRT. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `for package in ("nvidia-cutlass-dsl", "nvidia-cudnn-frontend"):` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 try:

This line invokes `try:` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 print(f"{package}={metadata.version(package)}")

This line invokes `print(f"{package}={metadata.version(package)}")` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 except metadata.PackageNotFoundError:

This line invokes `except` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 print(f"{package}=missing")

This line invokes `print(f"{package}=missing")` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}=missing")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 PY

This line invokes `PY` in the TensorRT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 34 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/03-kernels/vendor_kernel_paths.sh

Revision: not supplied

shared engine bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is inference_runtime.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

triton-inference-server NVIDIA Triton Inference Server 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVIDIA Triton Inference Server

bash

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true
     E05  command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true
     E06  command -v kubectl >/dev/null && kubectl version --client || true
     E07  command -v helm >/dev/null && helm version --short || true
     E08
     E09  if [[ -n "${NGC_IMAGE:-}" ]]; then
     E10    docker pull "$NGC_IMAGE"
     E11    docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'
     E12  else
     E13    echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"
     E14  fi
     E15
     E16  if command -v kubectl >/dev/null; then
     E17    kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true
     E18    kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true
     E19    kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true
     E20  fi
     E21
     E22  if command -v nvidia-smi >/dev/null; then
     E23    nvidia-smi -L
     E24    nvidia-smi mig -lgip 2>/dev/null || true
     E25    nvidia-smi compute-mode --query 2>/dev/null || true
     E26  fi
     E27
     E28  test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"
     E29
     E30  cat <<'NOTE'
     E31  GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment
     E32  or isolation facilities. Their presence is not evidence that the selected
     E33  inference request used them.
     E34  NOTE
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `/usr/bin/env bash` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true

This line invokes `command` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true

This line invokes `command` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v kubectl >/dev/null && kubectl version --client || true

This line invokes `command` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 command -v helm >/dev/null && helm version --short || true

This line invokes `command` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if [[ -n "${NGC_IMAGE:-}" ]]; then

This line selects a control path using `if [[ -n "${NGC_IMAGE:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if [[ -n "${NGC_IMAGE:-}" ]]; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 docker pull "$NGC_IMAGE"

This line invokes `docker` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'

This line invokes `docker` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `else` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"

This line invokes `echo` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 fi

This line invokes `fi` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 if command -v kubectl >/dev/null; then

This line selects a control path using `if command -v kubectl >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if command -v kubectl >/dev/null; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true

This line invokes `kubectl` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true

This line invokes `kubectl` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true

This line binds or updates `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` for later source in NVIDIA Triton Inference Server. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 fi

This line invokes `fi` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 if command -v nvidia-smi >/dev/null; then

This line selects a control path using `if command -v nvidia-smi >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if command -v nvidia-smi >/dev/null; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 nvidia-smi -L

This line invokes `nvidia-smi` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 nvidia-smi mig -lgip 2>/dev/null || true

This line invokes `nvidia-smi` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvidia-smi compute-mode --query 2>/dev/null || true

This line invokes `nvidia-smi` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 fi

This line invokes `fi` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"

This line invokes `test` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 cat <<'NOTE'

This line invokes `cat` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment

This line invokes `GPU` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `GPU` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 or isolation facilities. Their presence is not evidence that the selected

This line invokes `or` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `or` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 inference request used them.

This line invokes `inference` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `inference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 NOTE

This line invokes `NOTE` in the NVIDIA Triton Inference Server source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

Revision: not supplied

shared engine bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is model_server.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nccl NCCL 55 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NCCL

cuda

REGISTERED SOURCE · 55 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/nccl_allreduce.cu

     E01  #include <cuda_runtime.h>
     E02  #include <nccl.h>
     E03
     E04  #include <cstdio>
     E05  #include <cstdlib>
     E06  #include <vector>
     E07
     E08  #define CUDA_CHECK(call) do { if ((call) != cudaSuccess) std::exit(2); } while (0)
     E09  #define NCCL_CHECK(call) do { if ((call) != ncclSuccess) std::exit(3); } while (0)
     E10
     E11  int main() {
     E12      int device_count = 0;
     E13      CUDA_CHECK(cudaGetDeviceCount(&device_count));
     E14      if (device_count < 2) {
     E15          std::fprintf(stderr, "two GPUs required\n");
     E16          return 77;
     E17      }
     E18
     E19      constexpr int ranks = 2;
     E20      constexpr int elements = 1024;
     E21      const int devices[ranks] = {0, 1};
     E22      std::vector<ncclComm_t> communicators(ranks);
     E23      std::vector<cudaStream_t> streams(ranks);
     E24      std::vector<float*> buffers(ranks);
     E25      NCCL_CHECK(ncclCommInitAll(communicators.data(), ranks, devices));
     E26
     E27      for (int rank = 0; rank < ranks; ++rank) {
     E28          CUDA_CHECK(cudaSetDevice(devices[rank]));
     E29          CUDA_CHECK(cudaStreamCreate(&streams[rank]));
     E30          CUDA_CHECK(cudaMalloc(&buffers[rank], elements * sizeof(float)));
     E31          std::vector<float> host(elements, static_cast<float>(rank + 1));
     E32          CUDA_CHECK(cudaMemcpyAsync(buffers[rank], host.data(), elements * sizeof(float),
     E33                                     cudaMemcpyHostToDevice, streams[rank]));
     E34      }
     E35
     E36      NCCL_CHECK(ncclGroupStart());
     E37      for (int rank = 0; rank < ranks; ++rank) {
     E38          NCCL_CHECK(ncclAllReduce(buffers[rank], buffers[rank], elements, ncclFloat,
     E39                                   ncclSum, communicators[rank], streams[rank]));
     E40      }
     E41      NCCL_CHECK(ncclGroupEnd());
     E42
     E43      for (int rank = 0; rank < ranks; ++rank) {
     E44          CUDA_CHECK(cudaSetDevice(devices[rank]));
     E45          float first = 0.0F;
     E46          CUDA_CHECK(cudaMemcpyAsync(&first, buffers[rank], sizeof(first),
     E47                                     cudaMemcpyDeviceToHost, streams[rank]));
     E48          CUDA_CHECK(cudaStreamSynchronize(streams[rank]));
     E49          std::printf("rank=%d first=%.1f expected=3.0\n", rank, first);
     E50          CUDA_CHECK(cudaFree(buffers[rank]));
     E51          CUDA_CHECK(cudaStreamDestroy(streams[rank]));
     E52          NCCL_CHECK(ncclCommDestroy(communicators[rank]));
     E53      }
     E54  }
     E55  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 55 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cuda_runtime.h>

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 #include <nccl.h>

This comment documents `include <nccl.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 #include <cstdlib>

This comment documents `include <cstdlib>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #include <vector>

This comment documents `include <vector>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 #define CUDA_CHECK(call) do { if ((call) != cudaSuccess) std::exit(2); } while (0)

This comment documents `define CUDA_CHECK(call) do { if ((call) != cudaSuccess) std::exit(2); } while (0)` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 #define NCCL_CHECK(call) do { if ((call) != ncclSuccess) std::exit(3); } while (0)

This comment documents `define NCCL_CHECK(call) do { if ((call) != ncclSuccess) std::exit(3); } while (0)` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 int main() {

This line begins the `main` callable contract used by NCCL; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 int device_count = 0;

This line binds or updates `device_count = 0` for later source in NCCL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `device_count = 0` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 CUDA_CHECK(cudaGetDeviceCount(&device_count));

This line invokes the call chain `CUDA_CHECK → cudaGetDeviceCount` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaGetDeviceCount` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 if (device_count < 2) {

This line selects a control path using `if (device_count < 2) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if (device_count < 2) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 std::fprintf(stderr, "two GPUs required\n");

This continuation line declares or passes `std::fprintf(stderr, "two GPUs required\n");` as part of the surrounding call or signature in NCCL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `std::fprintf(stderr, "two GPUs required\n");` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 return 77;

This line returns `return 77;` to the caller of the surrounding function. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `return 77;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 constexpr int ranks = 2;

This line binds or updates `ranks = 2` for later source in NCCL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `ranks = 2` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 constexpr int elements = 1024;

This line binds or updates `elements = 1024` for later source in NCCL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `elements = 1024` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 const int devices[ranks] = {0, 1};

This line binds or updates `devices[ranks] = {0, 1}` for later source in NCCL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `devices[ranks] = {0, 1}` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 std::vector<ncclComm_t> communicators(ranks);

This line begins the `communicators` callable contract used by NCCL; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `communicators` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 std::vector<cudaStream_t> streams(ranks);

This line begins the `streams` callable contract used by NCCL; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `streams` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 std::vector<float*> buffers(ranks);

This continuation line declares or passes `std::vector<float*> buffers(ranks);` as part of the surrounding call or signature in NCCL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `std::vector<float*> buffers(ranks);` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 NCCL_CHECK(ncclCommInitAll(communicators.data(), ranks, devices));

This line invokes the call chain `NCCL_CHECK → ncclCommInitAll → communicators.data` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `NCCL_CHECK → ncclCommInitAll → communicators.data` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 for (int rank = 0; rank < ranks; ++rank) {

This line begins the repeated control path `for (int rank = 0; rank < ranks; ++rank) {` inside NCCL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for (int rank = 0; rank < ranks; ++rank) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 CUDA_CHECK(cudaSetDevice(devices[rank]));

This line invokes the call chain `CUDA_CHECK → cudaSetDevice` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaSetDevice` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 CUDA_CHECK(cudaStreamCreate(&streams[rank]));

This line invokes the call chain `CUDA_CHECK → cudaStreamCreate` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaStreamCreate` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 CUDA_CHECK(cudaMalloc(&buffers[rank], elements * sizeof(float)));

This line invokes the call chain `CUDA_CHECK → cudaMalloc → sizeof` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaMalloc → sizeof` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests storage; allocator, device, shape, dtype, lifetime, and runtime state determine whether and how many bytes occupy HBM.
Useful work / business implication
This line requests or defines storage. It can change admitted batch or context size, allocator latency, fragmentation, and out-of-memory risk. It does not prove physical HBM residency or bytes moved until the allocation, address, device, and same-run memory receipt are joined.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 std::vector<float> host(elements, static_cast<float>(rank + 1));

This line begins the `host` callable contract used by NCCL; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `host` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 CUDA_CHECK(cudaMemcpyAsync(buffers[rank], host.data(), elements * sizeof(float),

This call enqueues an asynchronous CUDA copy on the supplied stream.

Source
The arguments declare source, destination, byte count, transfer direction, and stream ordering.
Runtime / compiler
The CUDA runtime submits a copy operation that can overlap with other stream work subject to dependencies.
GPU execution
A copy engine or runtime-managed transfer path may perform the movement; this source does not prove the selected engine.
Memory path
Direction and byte-count arguments bound the requested movement; physical link, cache interaction, timing, and observed HBM traffic need a receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 cudaMemcpyHostToDevice, streams[rank]));

This exact expression `cudaMemcpyHostToDevice, streams[rank]));` contributes to the surrounding NCCL statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cudaMemcpyHostToDevice, streams[rank]));` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 NCCL_CHECK(ncclGroupStart());

This line invokes the call chain `NCCL_CHECK → ncclGroupStart` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `NCCL_CHECK → ncclGroupStart` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 for (int rank = 0; rank < ranks; ++rank) {

This line begins the repeated control path `for (int rank = 0; rank < ranks; ++rank) {` inside NCCL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for (int rank = 0; rank < ranks; ++rank) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 NCCL_CHECK(ncclAllReduce(buffers[rank], buffers[rank], elements, ncclFloat,

This line invokes the call chain `NCCL_CHECK → ncclAllReduce` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `NCCL_CHECK → ncclAllReduce` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 ncclSum, communicators[rank], streams[rank]));

This exact expression `ncclSum, communicators[rank], streams[rank]));` contributes to the surrounding NCCL statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `ncclSum, communicators[rank], streams[rank]));` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 NCCL_CHECK(ncclGroupEnd());

This line invokes the call chain `NCCL_CHECK → ncclGroupEnd` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `NCCL_CHECK → ncclGroupEnd` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 for (int rank = 0; rank < ranks; ++rank) {

This line begins the repeated control path `for (int rank = 0; rank < ranks; ++rank) {` inside NCCL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for (int rank = 0; rank < ranks; ++rank) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 CUDA_CHECK(cudaSetDevice(devices[rank]));

This line invokes the call chain `CUDA_CHECK → cudaSetDevice` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaSetDevice` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 float first = 0.0F;

This line binds or updates `first = 0.0F` for later source in NCCL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `first = 0.0F` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 CUDA_CHECK(cudaMemcpyAsync(&first, buffers[rank], sizeof(first),

This call enqueues an asynchronous CUDA copy on the supplied stream.

Source
The arguments declare source, destination, byte count, transfer direction, and stream ordering.
Runtime / compiler
The CUDA runtime submits a copy operation that can overlap with other stream work subject to dependencies.
GPU execution
A copy engine or runtime-managed transfer path may perform the movement; this source does not prove the selected engine.
Memory path
Direction and byte-count arguments bound the requested movement; physical link, cache interaction, timing, and observed HBM traffic need a receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 cudaMemcpyDeviceToHost, streams[rank]));

This exact expression `cudaMemcpyDeviceToHost, streams[rank]));` contributes to the surrounding NCCL statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cudaMemcpyDeviceToHost, streams[rank]));` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 CUDA_CHECK(cudaStreamSynchronize(streams[rank]));

This wrapped CUDA call blocks the host until all previously submitted work on `stream` completes.

Source
CUDA_CHECK surfaces synchronization failure after the runtime waits for the stream completion point.
Runtime / compiler
The host thread waits; this closes the asynchronous interval before reading results or reporting timing.
GPU execution
It waits on already selected device work and does not choose a kernel, SM, warp, or copy engine.
Memory path
Synchronization can expose transfer or kernel completion but does not itself report cache, HBM bytes, power, or energy.
Useful work / business implication
This line creates an ordering boundary. It can expose idle time, prevent unsafe overlap, or lengthen the critical path. Its business effect appears in accepted-task latency and throughput, not in the synchronization call by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 std::printf("rank=%d first=%.1f expected=3.0\n", rank, first);

This line binds or updates `first = %.1f expected=3.0\n", rank, first)` for later source in NCCL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `first = %.1f expected=3.0\n", rank, first)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 CUDA_CHECK(cudaFree(buffers[rank]));

This line invokes the call chain `CUDA_CHECK → cudaFree` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaFree` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 CUDA_CHECK(cudaStreamDestroy(streams[rank]));

This line invokes the call chain `CUDA_CHECK → cudaStreamDestroy` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CUDA_CHECK → cudaStreamDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 NCCL_CHECK(ncclCommDestroy(communicators[rank]));

This line invokes the call chain `NCCL_CHECK → ncclCommDestroy` when NCCL executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `NCCL_CHECK → ncclCommDestroy` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 55 Read this exact line
#include <cuda_runtime.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cuda_runtime.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/04-distributed/nccl_allreduce.cu

Revision: not supplied

shared operator cuda coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is collective_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nccl-tests NCCL Tests 30 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NCCL Tests

bash

REGISTERED SOURCE · 30 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true
     E05  command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true
     E06  command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true
     E07
     E08  if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then
     E09    "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E10    if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then
     E11      "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E12    fi
     E13  else
     E14    echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"
     E15  fi
     E16
     E17  for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do
     E18    if command -v "$tool" >/dev/null; then
     E19      "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true
     E20    else
     E21      echo "$tool=missing"
     E22    fi
     E23  done
     E24
     E25  cat <<'NOTE'
     E26  NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2
     E27  throughput, KV movement, or accepted-task quality. Join their artifacts to the
     E28  same host, topology, driver, and time boundary as the workload receipt.
     E29  NOTE
     E30  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 30 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true

This line invokes `command` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true

This line invokes `command` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true

This line invokes `command` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then

This line selects a control path using `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding NCCL Tests statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then

This line selects a control path using `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding NCCL Tests statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"

This line invokes `echo` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 fi

This line invokes `fi` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do

This line begins the repeated control path `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` inside NCCL Tests. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v "$tool" >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` contributes to the surrounding NCCL Tests statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 echo "$tool=missing"

This line invokes `echo` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 fi

This line invokes `fi` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 done

This line invokes `done` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 cat <<'NOTE'

This line invokes `cat` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2

This line invokes `NCCL` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NCCL` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 throughput, KV movement, or accepted-task quality. Join their artifacts to the

This line invokes `throughput,` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `throughput,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 same host, topology, driver, and time boundary as the workload receipt.

This line invokes `same` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `same` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 NOTE

This line invokes `NOTE` in the NCCL Tests source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 30 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is fabric_benchmark.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvshmem NVSHMEM 30 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVSHMEM

bash

REGISTERED SOURCE · 30 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true
     E05  command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true
     E06  command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true
     E07
     E08  if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then
     E09    "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E10    if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then
     E11      "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E12    fi
     E13  else
     E14    echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"
     E15  fi
     E16
     E17  for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do
     E18    if command -v "$tool" >/dev/null; then
     E19      "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true
     E20    else
     E21      echo "$tool=missing"
     E22    fi
     E23  done
     E24
     E25  cat <<'NOTE'
     E26  NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2
     E27  throughput, KV movement, or accepted-task quality. Join their artifacts to the
     E28  same host, topology, driver, and time boundary as the workload receipt.
     E29  NOTE
     E30  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 30 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true

This line invokes `command` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true

This line invokes `command` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true

This line invokes `command` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then

This line selects a control path using `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding NVSHMEM statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then

This line selects a control path using `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding NVSHMEM statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"

This line invokes `echo` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 fi

This line invokes `fi` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do

This line begins the repeated control path `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` inside NVSHMEM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v "$tool" >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` contributes to the surrounding NVSHMEM statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 echo "$tool=missing"

This line invokes `echo` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 fi

This line invokes `fi` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 done

This line invokes `done` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 cat <<'NOTE'

This line invokes `cat` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2

This line invokes `NCCL` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NCCL` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 throughput, KV movement, or accepted-task quality. Join their artifacts to the

This line invokes `throughput,` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `throughput,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 same host, topology, driver, and time boundary as the workload receipt.

This line invokes `same` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `same` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 NOTE

This line invokes `NOTE` in the NVSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 30 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

Revision: not supplied

shared operator bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is one_sided_communication.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvswitch NVSwitch 30 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVSwitch

bash

REGISTERED SOURCE · 30 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true
     E05  command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true
     E06  command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true
     E07
     E08  if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then
     E09    "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E10    if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then
     E11      "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E12    fi
     E13  else
     E14    echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"
     E15  fi
     E16
     E17  for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do
     E18    if command -v "$tool" >/dev/null; then
     E19      "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true
     E20    else
     E21      echo "$tool=missing"
     E22    fi
     E23  done
     E24
     E25  cat <<'NOTE'
     E26  NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2
     E27  throughput, KV movement, or accepted-task quality. Join their artifacts to the
     E28  same host, topology, driver, and time boundary as the workload receipt.
     E29  NOTE
     E30  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 30 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true

This line invokes `command` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true

This line invokes `command` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true

This line invokes `command` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then

This line selects a control path using `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding NVSwitch statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then

This line selects a control path using `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding NVSwitch statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"

This line invokes `echo` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 fi

This line invokes `fi` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do

This line begins the repeated control path `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` inside NVSwitch. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v "$tool" >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` contributes to the surrounding NVSwitch statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 echo "$tool=missing"

This line invokes `echo` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 fi

This line invokes `fi` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 done

This line invokes `done` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 cat <<'NOTE'

This line invokes `cat` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2

This line invokes `NCCL` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NCCL` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 throughput, KV movement, or accepted-task quality. Join their artifacts to the

This line invokes `throughput,` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `throughput,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 same host, topology, driver, and time boundary as the workload receipt.

This line invokes `same` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `same` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 NOTE

This line invokes `NOTE` in the NVSwitch source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 30 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is hardware_switch.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

gpudirect-rdma GPUDirect RDMA 30 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

GPUDirect RDMA

bash

REGISTERED SOURCE · 30 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true
     E05  command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true
     E06  command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true
     E07
     E08  if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then
     E09    "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E10    if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then
     E11      "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E12    fi
     E13  else
     E14    echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"
     E15  fi
     E16
     E17  for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do
     E18    if command -v "$tool" >/dev/null; then
     E19      "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true
     E20    else
     E21      echo "$tool=missing"
     E22    fi
     E23  done
     E24
     E25  cat <<'NOTE'
     E26  NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2
     E27  throughput, KV movement, or accepted-task quality. Join their artifacts to the
     E28  same host, topology, driver, and time boundary as the workload receipt.
     E29  NOTE
     E30  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 30 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true

This line invokes `command` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true

This line invokes `command` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true

This line invokes `command` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then

This line selects a control path using `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding GPUDirect RDMA statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then

This line selects a control path using `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding GPUDirect RDMA statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"

This line invokes `echo` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 fi

This line invokes `fi` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do

This line begins the repeated control path `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` inside GPUDirect RDMA. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v "$tool" >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` contributes to the surrounding GPUDirect RDMA statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 echo "$tool=missing"

This line invokes `echo` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 fi

This line invokes `fi` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 done

This line invokes `done` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 cat <<'NOTE'

This line invokes `cat` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2

This line invokes `NCCL` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NCCL` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 throughput, KV movement, or accepted-task quality. Join their artifacts to the

This line invokes `throughput,` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `throughput,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 same host, topology, driver, and time boundary as the workload receipt.

This line invokes `same` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `same` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 NOTE

This line invokes `NOTE` in the GPUDirect RDMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 30 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

Revision: not supplied

shared operator bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is data_path.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

dynamo NVIDIA Dynamo 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVIDIA Dynamo

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # Capability probes for the state-movement layer. No successful --help call is
     E05  # evidence that bytes moved during C-001.
     E06
     E07  for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do
     E08    if command -v "$tool" >/dev/null; then
     E09      printf '%s=' "$tool"
     E10      "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true
     E11    else
     E12      echo "$tool=missing"
     E13    fi
     E14  done
     E15
     E16  python3 - <<'PY'
     E17  import importlib.metadata as metadata
     E18
     E19  for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):
     E20      try:
     E21          print(f"{package}={metadata.version(package)}")
     E22      except metadata.PackageNotFoundError:
     E23          print(f"{package}=missing")
     E24  PY
     E25
     E26  test -e /usr/local/cuda/include/cufile.h && echo "cufile_header=present" || echo "cufile_header=missing"
     E27  test -e /dev/infiniband/uverbs0 && echo "rdma_device=present" || echo "rdma_device=missing"
     E28
     E29  cat <<'NOTE'
     E30  Required receipt fields for any transfer claim:
     E31    source_tier, destination_tier, bytes, registration_us, submit_us,
     E32    completion_us, transport, fallback, retry_count, run_id.
     E33  Do not call host memory CXL memory unless the physical platform and NUMA/CXL
     E34  topology prove it.
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `/usr/bin/env bash` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Capability probes for the state-movement layer. No successful --help call is

This comment documents `Capability probes for the state-movement layer. No successful --help call is` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # evidence that bytes moved during C-001.

This comment documents `evidence that bytes moved during C-001.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do

This line begins the repeated control path `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` inside NVIDIA Dynamo. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if command -v "$tool" >/dev/null; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 printf '%s=' "$tool"

This line invokes `printf` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` contributes to the surrounding NVIDIA Dynamo statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `else` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 echo "$tool=missing"

This line invokes `echo` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 fi

This line invokes `fi` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 done

This line invokes `done` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 python3 - <<'PY'

This line invokes `python3` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import importlib.metadata as metadata` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):

This line begins the repeated control path `for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):` inside NVIDIA Dynamo. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 try:

This line invokes `try:` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 print(f"{package}={metadata.version(package)}")

This line invokes `print(f"{package}={metadata.version(package)}")` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 except metadata.PackageNotFoundError:

This line invokes `except` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 print(f"{package}=missing")

This line invokes `print(f"{package}=missing")` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}=missing")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 PY

This line invokes `PY` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 test -e /usr/local/cuda/include/cufile.h && echo "cufile_header=present" || echo "cufile_header=missing"

This line invokes `test` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 test -e /dev/infiniband/uverbs0 && echo "rdma_device=present" || echo "rdma_device=missing"

This line invokes `test` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 cat <<'NOTE'

This line invokes `cat` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Required receipt fields for any transfer claim:

This line invokes `Required` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Required` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 source_tier, destination_tier, bytes, registration_us, submit_us,

This line invokes `source_tier,` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `source_tier,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 completion_us, transport, fallback, retry_count, run_id.

This line invokes `completion_us,` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `completion_us,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 Do not call host memory CXL memory unless the physical platform and NUMA/CXL

This line invokes `Do` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Do` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 topology prove it.

This line invokes `topology` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `topology` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the NVIDIA Dynamo source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA / ai-dynamo open-source project

Source path: examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

Revision: not supplied

shared engine bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is distributed_serving.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nixl NIXL 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NIXL

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # Capability probes for the state-movement layer. No successful --help call is
     E05  # evidence that bytes moved during C-001.
     E06
     E07  for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do
     E08    if command -v "$tool" >/dev/null; then
     E09      printf '%s=' "$tool"
     E10      "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true
     E11    else
     E12      echo "$tool=missing"
     E13    fi
     E14  done
     E15
     E16  python3 - <<'PY'
     E17  import importlib.metadata as metadata
     E18
     E19  for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):
     E20      try:
     E21          print(f"{package}={metadata.version(package)}")
     E22      except metadata.PackageNotFoundError:
     E23          print(f"{package}=missing")
     E24  PY
     E25
     E26  test -e /usr/local/cuda/include/cufile.h && echo "cufile_header=present" || echo "cufile_header=missing"
     E27  test -e /dev/infiniband/uverbs0 && echo "rdma_device=present" || echo "rdma_device=missing"
     E28
     E29  cat <<'NOTE'
     E30  Required receipt fields for any transfer claim:
     E31    source_tier, destination_tier, bytes, registration_us, submit_us,
     E32    completion_us, transport, fallback, retry_count, run_id.
     E33  Do not call host memory CXL memory unless the physical platform and NUMA/CXL
     E34  topology prove it.
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `/usr/bin/env bash` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Capability probes for the state-movement layer. No successful --help call is

This comment documents `Capability probes for the state-movement layer. No successful --help call is` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # evidence that bytes moved during C-001.

This comment documents `evidence that bytes moved during C-001.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do

This line begins the repeated control path `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` inside NIXL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if command -v "$tool" >/dev/null; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 printf '%s=' "$tool"

This line invokes `printf` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` contributes to the surrounding NIXL statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `else` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 echo "$tool=missing"

This line invokes `echo` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 fi

This line invokes `fi` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 done

This line invokes `done` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 python3 - <<'PY'

This line invokes `python3` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import importlib.metadata as metadata` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):

This line begins the repeated control path `for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):` inside NIXL. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 try:

This line invokes `try:` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 print(f"{package}={metadata.version(package)}")

This line invokes `print(f"{package}={metadata.version(package)}")` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 except metadata.PackageNotFoundError:

This line invokes `except` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 print(f"{package}=missing")

This line invokes `print(f"{package}=missing")` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}=missing")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 PY

This line invokes `PY` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 test -e /usr/local/cuda/include/cufile.h && echo "cufile_header=present" || echo "cufile_header=missing"

This line invokes `test` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 test -e /dev/infiniband/uverbs0 && echo "rdma_device=present" || echo "rdma_device=missing"

This line invokes `test` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 cat <<'NOTE'

This line invokes `cat` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Required receipt fields for any transfer claim:

This line invokes `Required` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Required` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 source_tier, destination_tier, bytes, registration_us, submit_us,

This line invokes `source_tier,` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `source_tier,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 completion_us, transport, fallback, retry_count, run_id.

This line invokes `completion_us,` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `completion_us,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 Do not call host memory CXL memory unless the physical platform and NUMA/CXL

This line invokes `Do` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Do` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 topology prove it.

This line invokes `topology` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `topology` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the NIXL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA / ai-dynamo open-source project

Source path: examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

Revision: not supplied

shared engine bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is data_movement.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

kvbm Dynamo KVBM 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Dynamo KVBM

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # Capability probes for the state-movement layer. No successful --help call is
     E05  # evidence that bytes moved during C-001.
     E06
     E07  for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do
     E08    if command -v "$tool" >/dev/null; then
     E09      printf '%s=' "$tool"
     E10      "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true
     E11    else
     E12      echo "$tool=missing"
     E13    fi
     E14  done
     E15
     E16  python3 - <<'PY'
     E17  import importlib.metadata as metadata
     E18
     E19  for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):
     E20      try:
     E21          print(f"{package}={metadata.version(package)}")
     E22      except metadata.PackageNotFoundError:
     E23          print(f"{package}=missing")
     E24  PY
     E25
     E26  test -e /usr/local/cuda/include/cufile.h && echo "cufile_header=present" || echo "cufile_header=missing"
     E27  test -e /dev/infiniband/uverbs0 && echo "rdma_device=present" || echo "rdma_device=missing"
     E28
     E29  cat <<'NOTE'
     E30  Required receipt fields for any transfer claim:
     E31    source_tier, destination_tier, bytes, registration_us, submit_us,
     E32    completion_us, transport, fallback, retry_count, run_id.
     E33  Do not call host memory CXL memory unless the physical platform and NUMA/CXL
     E34  topology prove it.
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `/usr/bin/env bash` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Capability probes for the state-movement layer. No successful --help call is

This comment documents `Capability probes for the state-movement layer. No successful --help call is` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # evidence that bytes moved during C-001.

This comment documents `evidence that bytes moved during C-001.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do

This line begins the repeated control path `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` inside Dynamo KVBM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if command -v "$tool" >/dev/null; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 printf '%s=' "$tool"

This line invokes `printf` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` contributes to the surrounding Dynamo KVBM statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `else` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 echo "$tool=missing"

This line invokes `echo` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 fi

This line invokes `fi` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 done

This line invokes `done` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 python3 - <<'PY'

This line invokes `python3` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `import importlib.metadata as metadata` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):

This line begins the repeated control path `for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):` inside Dynamo KVBM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 try:

This line invokes `try:` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 print(f"{package}={metadata.version(package)}")

This line invokes `print(f"{package}={metadata.version(package)}")` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 except metadata.PackageNotFoundError:

This line invokes `except` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 print(f"{package}=missing")

This line invokes `print(f"{package}=missing")` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}=missing")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 PY

This line invokes `PY` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 test -e /usr/local/cuda/include/cufile.h && echo "cufile_header=present" || echo "cufile_header=missing"

This line invokes `test` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 test -e /dev/infiniband/uverbs0 && echo "rdma_device=present" || echo "rdma_device=missing"

This line invokes `test` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 cat <<'NOTE'

This line invokes `cat` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Required receipt fields for any transfer claim:

This line invokes `Required` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Required` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 source_tier, destination_tier, bytes, registration_us, submit_us,

This line invokes `source_tier,` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `source_tier,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 completion_us, transport, fallback, retry_count, run_id.

This line invokes `completion_us,` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `completion_us,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 Do not call host memory CXL memory unless the physical platform and NUMA/CXL

This line invokes `Do` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Do` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 topology prove it.

This line invokes `topology` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `topology` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the Dynamo KVBM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA / ai-dynamo open-source project

Source path: examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

Revision: not supplied

shared engine bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is kv_cache.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

gpudirect-storage-cufile GPUDirect Storage and cuFile 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

GPUDirect Storage and cuFile

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # Capability probes for the state-movement layer. No successful --help call is
     E05  # evidence that bytes moved during C-001.
     E06
     E07  for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do
     E08    if command -v "$tool" >/dev/null; then
     E09      printf '%s=' "$tool"
     E10      "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true
     E11    else
     E12      echo "$tool=missing"
     E13    fi
     E14  done
     E15
     E16  python3 - <<'PY'
     E17  import importlib.metadata as metadata
     E18
     E19  for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):
     E20      try:
     E21          print(f"{package}={metadata.version(package)}")
     E22      except metadata.PackageNotFoundError:
     E23          print(f"{package}=missing")
     E24  PY
     E25
     E26  test -e /usr/local/cuda/include/cufile.h && echo "cufile_header=present" || echo "cufile_header=missing"
     E27  test -e /dev/infiniband/uverbs0 && echo "rdma_device=present" || echo "rdma_device=missing"
     E28
     E29  cat <<'NOTE'
     E30  Required receipt fields for any transfer claim:
     E31    source_tier, destination_tier, bytes, registration_us, submit_us,
     E32    completion_us, transport, fallback, retry_count, run_id.
     E33  Do not call host memory CXL memory unless the physical platform and NUMA/CXL
     E34  topology prove it.
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Capability probes for the state-movement layer. No successful --help call is

This comment documents `Capability probes for the state-movement layer. No successful --help call is` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # evidence that bytes moved during C-001.

This comment documents `evidence that bytes moved during C-001.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do

This line begins the repeated control path `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` inside GPUDirect Storage and cuFile. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v "$tool" >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 printf '%s=' "$tool"

This line invokes `printf` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` contributes to the surrounding GPUDirect Storage and cuFile statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 echo "$tool=missing"

This line invokes `echo` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 fi

This line invokes `fi` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 done

This line invokes `done` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 python3 - <<'PY'

This line invokes `python3` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):

This line begins the repeated control path `for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):` inside GPUDirect Storage and cuFile. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 try:

This line invokes `try:` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 print(f"{package}={metadata.version(package)}")

This line invokes `print(f"{package}={metadata.version(package)}")` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 except metadata.PackageNotFoundError:

This line invokes `except` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 print(f"{package}=missing")

This line invokes `print(f"{package}=missing")` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}=missing")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 PY

This line invokes `PY` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 test -e /usr/local/cuda/include/cufile.h && echo "cufile_header=present" || echo "cufile_header=missing"

This line invokes `test` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 test -e /dev/infiniband/uverbs0 && echo "rdma_device=present" || echo "rdma_device=missing"

This line invokes `test` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 cat <<'NOTE'

This line invokes `cat` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Required receipt fields for any transfer claim:

This line invokes `Required` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Required` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 source_tier, destination_tier, bytes, registration_us, submit_us,

This line invokes `source_tier,` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `source_tier,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 completion_us, transport, fallback, retry_count, run_id.

This line invokes `completion_us,` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `completion_us,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 Do not call host memory CXL memory unless the physical platform and NUMA/CXL

This line invokes `Do` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Do` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 topology prove it.

This line invokes `topology` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `topology` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the GPUDirect Storage and cuFile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

Revision: not supplied

shared operator bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is storage_data_path.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvcomp nvCOMP 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

nvCOMP

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # Capability probes for the state-movement layer. No successful --help call is
     E05  # evidence that bytes moved during C-001.
     E06
     E07  for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do
     E08    if command -v "$tool" >/dev/null; then
     E09      printf '%s=' "$tool"
     E10      "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true
     E11    else
     E12      echo "$tool=missing"
     E13    fi
     E14  done
     E15
     E16  python3 - <<'PY'
     E17  import importlib.metadata as metadata
     E18
     E19  for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):
     E20      try:
     E21          print(f"{package}={metadata.version(package)}")
     E22      except metadata.PackageNotFoundError:
     E23          print(f"{package}=missing")
     E24  PY
     E25
     E26  test -e /usr/local/cuda/include/cufile.h && echo "cufile_header=present" || echo "cufile_header=missing"
     E27  test -e /dev/infiniband/uverbs0 && echo "rdma_device=present" || echo "rdma_device=missing"
     E28
     E29  cat <<'NOTE'
     E30  Required receipt fields for any transfer claim:
     E31    source_tier, destination_tier, bytes, registration_us, submit_us,
     E32    completion_us, transport, fallback, retry_count, run_id.
     E33  Do not call host memory CXL memory unless the physical platform and NUMA/CXL
     E34  topology prove it.
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Capability probes for the state-movement layer. No successful --help call is

This comment documents `Capability probes for the state-movement layer. No successful --help call is` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # evidence that bytes moved during C-001.

This comment documents `evidence that bytes moved during C-001.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do

This line begins the repeated control path `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` inside nvCOMP. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for tool in nixlbench ucx_info gdscheck.py gdsio nvidia-ctk; do` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v "$tool" >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 printf '%s=' "$tool"

This line invokes `printf` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 "$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` contributes to the surrounding nvCOMP statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$tool" --version 2>/dev/null || "$tool" --help 2>&1 | sed -n '1p' || true` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 echo "$tool=missing"

This line invokes `echo` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 fi

This line invokes `fi` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 done

This line invokes `done` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 python3 - <<'PY'

This line invokes `python3` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):

This line begins the repeated control path `for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):` inside nvCOMP. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for package in ("ai-dynamo", "nixl", "kvbm", "nvidia-nvcomp-cu13"):` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 try:

This line invokes `try:` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 print(f"{package}={metadata.version(package)}")

This line invokes `print(f"{package}={metadata.version(package)}")` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 except metadata.PackageNotFoundError:

This line invokes `except` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 print(f"{package}=missing")

This line invokes `print(f"{package}=missing")` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{package}=missing")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 PY

This line invokes `PY` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 test -e /usr/local/cuda/include/cufile.h && echo "cufile_header=present" || echo "cufile_header=missing"

This line invokes `test` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 test -e /dev/infiniband/uverbs0 && echo "rdma_device=present" || echo "rdma_device=missing"

This line invokes `test` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 cat <<'NOTE'

This line invokes `cat` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Required receipt fields for any transfer claim:

This line invokes `Required` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Required` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 source_tier, destination_tier, bytes, registration_us, submit_us,

This line invokes `source_tier,` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `source_tier,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 completion_us, transport, fallback, retry_count, run_id.

This line invokes `completion_us,` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `completion_us,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 Do not call host memory CXL memory unless the physical platform and NUMA/CXL

This line invokes `Do` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Do` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 topology prove it.

This line invokes `topology` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `topology` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the nvCOMP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/04-distributed/state_movement.sh

Revision: not supplied

shared operator bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is compression.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cuda-unified-memory CUDA Unified Memory 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUDA Unified Memory

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in CUDA Unified Memory. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in CUDA Unified Memory. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in CUDA Unified Memory. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by CUDA Unified Memory. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by CUDA Unified Memory. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by CUDA Unified Memory. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by CUDA Unified Memory. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside CUDA Unified Memory. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the CUDA Unified Memory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: not_started observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is memory_management.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=not_started and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cuda-vmm CUDA Virtual Memory Management 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUDA Virtual Memory Management

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in CUDA Virtual Memory Management. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in CUDA Virtual Memory Management. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in CUDA Virtual Memory Management. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by CUDA Virtual Memory Management. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by CUDA Virtual Memory Management. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by CUDA Virtual Memory Management. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by CUDA Virtual Memory Management. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside CUDA Virtual Memory Management. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the CUDA Virtual Memory Management source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: not_started observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is memory_management.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=not_started and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvtx NVTX 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVTX

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  if [[ $# -lt 1 ]]; then
     E05    echo "usage: $0 command [args ...]" >&2
     E06    exit 2
     E07  fi
     E08
     E09  run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"
     E10  out="${ARTIFACT_DIR:-artifacts/$run_id}"
     E11  mkdir -p "$out"
     E12
     E13  nvidia-smi -q > "$out/nvidia-smi-q.txt"
     E14  nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"
     E15  dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true
     E16
     E17  nsys profile \
     E18    --trace=cuda,nvtx,osrt \
     E19    --sample=none \
     E20    --force-overwrite=true \
     E21    --output="$out/timeline" \
     E22    "$@"
     E23
     E24  printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"
     E25  printf '%q ' "$@" >> "$out/run.txt"
     E26  printf '\n' >> "$out/run.txt"
     E27
     E28  cat <<NOTE
     E29  Captured $out/timeline.nsys-rep.
     E30  Run Nsight Compute only on a selected kernel, for example:
     E31    ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>
     E32  Run correctness separately:
     E33    compute-sanitizer --tool memcheck <kernel-test>
     E34    compute-sanitizer --tool racecheck <kernel-test>
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 if [[ $# -lt 1 ]]; then

This line selects a control path using `if [[ $# -lt 1 ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ $# -lt 1 ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 echo "usage: $0 command [args ...]" >&2

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 exit 2

This line invokes `exit` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `exit` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 fi

This line invokes `fi` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"

This line binds or updates `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` for later source in NVTX. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 out="${ARTIFACT_DIR:-artifacts/$run_id}"

This line binds or updates `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` for later source in NVTX. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 mkdir -p "$out"

This line invokes `mkdir` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `mkdir` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 nvidia-smi -q > "$out/nvidia-smi-q.txt"

This command writes the selected NVIDIA device's detailed `nvidia-smi -q` inventory and telemetry snapshot to the receipt directory.

Source
The shell redirects the device query into `nvidia-smi-q.txt`.
Runtime / compiler
It captures host-visible device state and does not launch the target workload.
GPU execution
No workload kernel or execution unit is selected.
Memory path
The report can contain capacity and device telemetry, but it is not per-operation HBM traffic or same-run task energy by itself.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"

This command records the host-visible NVIDIA device topology matrix in the receipt directory.

Source
The shell redirects `nvidia-smi topo -m` output to `nvidia-smi-topo.txt`.
Runtime / compiler
It inventories possible peer and host paths; it does not prove that the workload used one.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
Topology labels constrain possible movement paths but do not report bytes, link use, HBM traffic, or timing.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true

This command records DCGM's discoverable GPU inventory and tolerates an unavailable DCGM installation.

Source
Output and errors go to `dcgm-discovery.txt`; `|| true` keeps the surrounding capture script running on failure.
Runtime / compiler
It probes monitoring availability and does not launch the model.
GPU execution
No workload execution unit is selected.
Memory path
Discovery proves no tensor placement, transfer, HBM traffic, power, or energy.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 nsys profile \

This command runs the declared target under Nsight Systems and requests the named trace domains.

Source
The CLI configures trace collection and an output artifact around the child process.
Runtime / compiler
Instrumentation can capture CUDA, NVTX, OS-runtime, and timing events and can add measurement overhead.
GPU execution
Profiler configuration does not select a workload kernel or GPU execution unit.
Memory path
A resulting trace may correlate transfers and kernels, but this command alone proves no tensor residency or HBM byte count.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 --trace=cuda,nvtx,osrt \

This continuation argument asks Nsight Systems to trace CUDA, NVTX, and OS-runtime events.

Source
The option configures which event domains appear in the generated timeline.
Runtime / compiler
Tracing wraps the later target command and can add collection overhead.
GPU execution
It observes API and timing events but does not select a workload kernel.
Memory path
The event domains can expose transfer calls, but counters and HBM bytes still require the captured trace.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 --sample=none \

This continuation argument disables periodic CPU instruction-pointer sampling during the Nsight Systems capture.

Source
The trace keeps the requested event domains without CPU sampling records.
Runtime / compiler
It changes profiler collection overhead and report contents, not workload semantics.
GPU execution
No GPU execution unit is selected.
Memory path
The option reports no tensor placement, transfer size, or HBM traffic.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 --force-overwrite=true \

This continuation argument allows the profiler to replace an existing output artifact at the chosen path.

Source
The capture does not stop merely because a prior file uses the same output name.
Runtime / compiler
It changes output-file handling only.
GPU execution
No GPU execution unit is selected.
Memory path
It changes host filesystem behavior, not GPU memory traffic.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 --output="$out/timeline" \

This continuation argument names the `timeline` output inside the receipt directory.

Source
Nsight Systems writes the captured artifact under the declared output prefix.
Runtime / compiler
It controls host artifact placement, not model dispatch.
GPU execution
No GPU execution unit is selected.
Memory path
The output path records no HBM movement until a real capture is produced.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 "$@"

This final shell line executes the exact command and arguments passed into the capture wrapper.

Source
The wrapper preserves argument boundaries and runs the caller-supplied target under Nsight Systems.
Runtime / compiler
The target command determines which engine, compiler, and workload paths actually execute.
GPU execution
Only the target's later dispatch can select kernels and GPU execution units.
Memory path
Only the target plus captured trace can establish tensor movement, cache behavior, or HBM traffic.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"

This line invokes `printf` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 printf '%q ' "$@" >> "$out/run.txt"

This line invokes `printf` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 printf '\n' >> "$out/run.txt"

This line invokes `printf` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 cat <<NOTE

This line invokes `cat` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 Captured $out/timeline.nsys-rep.

This line invokes `Captured` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Captured` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Run Nsight Compute only on a selected kernel, for example:

This line invokes `Run` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>

This line invokes `ncu` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ncu` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 Run correctness separately:

This line invokes `Run` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 compute-sanitizer --tool memcheck <kernel-test>

This line invokes `compute-sanitizer` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 compute-sanitizer --tool racecheck <kernel-test>

This line invokes `compute-sanitizer` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the NVTX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

Revision: not supplied

shared operator bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is instrumentation.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cupti CUPTI 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUPTI

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  if [[ $# -lt 1 ]]; then
     E05    echo "usage: $0 command [args ...]" >&2
     E06    exit 2
     E07  fi
     E08
     E09  run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"
     E10  out="${ARTIFACT_DIR:-artifacts/$run_id}"
     E11  mkdir -p "$out"
     E12
     E13  nvidia-smi -q > "$out/nvidia-smi-q.txt"
     E14  nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"
     E15  dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true
     E16
     E17  nsys profile \
     E18    --trace=cuda,nvtx,osrt \
     E19    --sample=none \
     E20    --force-overwrite=true \
     E21    --output="$out/timeline" \
     E22    "$@"
     E23
     E24  printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"
     E25  printf '%q ' "$@" >> "$out/run.txt"
     E26  printf '\n' >> "$out/run.txt"
     E27
     E28  cat <<NOTE
     E29  Captured $out/timeline.nsys-rep.
     E30  Run Nsight Compute only on a selected kernel, for example:
     E31    ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>
     E32  Run correctness separately:
     E33    compute-sanitizer --tool memcheck <kernel-test>
     E34    compute-sanitizer --tool racecheck <kernel-test>
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 if [[ $# -lt 1 ]]; then

This line selects a control path using `if [[ $# -lt 1 ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ $# -lt 1 ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 echo "usage: $0 command [args ...]" >&2

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 exit 2

This line invokes `exit` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `exit` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 fi

This line invokes `fi` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"

This line binds or updates `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` for later source in CUPTI. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 out="${ARTIFACT_DIR:-artifacts/$run_id}"

This line binds or updates `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` for later source in CUPTI. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 mkdir -p "$out"

This line invokes `mkdir` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `mkdir` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 nvidia-smi -q > "$out/nvidia-smi-q.txt"

This command writes the selected NVIDIA device's detailed `nvidia-smi -q` inventory and telemetry snapshot to the receipt directory.

Source
The shell redirects the device query into `nvidia-smi-q.txt`.
Runtime / compiler
It captures host-visible device state and does not launch the target workload.
GPU execution
No workload kernel or execution unit is selected.
Memory path
The report can contain capacity and device telemetry, but it is not per-operation HBM traffic or same-run task energy by itself.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"

This command records the host-visible NVIDIA device topology matrix in the receipt directory.

Source
The shell redirects `nvidia-smi topo -m` output to `nvidia-smi-topo.txt`.
Runtime / compiler
It inventories possible peer and host paths; it does not prove that the workload used one.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
Topology labels constrain possible movement paths but do not report bytes, link use, HBM traffic, or timing.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true

This command records DCGM's discoverable GPU inventory and tolerates an unavailable DCGM installation.

Source
Output and errors go to `dcgm-discovery.txt`; `|| true` keeps the surrounding capture script running on failure.
Runtime / compiler
It probes monitoring availability and does not launch the model.
GPU execution
No workload execution unit is selected.
Memory path
Discovery proves no tensor placement, transfer, HBM traffic, power, or energy.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 nsys profile \

This command runs the declared target under Nsight Systems and requests the named trace domains.

Source
The CLI configures trace collection and an output artifact around the child process.
Runtime / compiler
Instrumentation can capture CUDA, NVTX, OS-runtime, and timing events and can add measurement overhead.
GPU execution
Profiler configuration does not select a workload kernel or GPU execution unit.
Memory path
A resulting trace may correlate transfers and kernels, but this command alone proves no tensor residency or HBM byte count.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 --trace=cuda,nvtx,osrt \

This continuation argument asks Nsight Systems to trace CUDA, NVTX, and OS-runtime events.

Source
The option configures which event domains appear in the generated timeline.
Runtime / compiler
Tracing wraps the later target command and can add collection overhead.
GPU execution
It observes API and timing events but does not select a workload kernel.
Memory path
The event domains can expose transfer calls, but counters and HBM bytes still require the captured trace.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 --sample=none \

This continuation argument disables periodic CPU instruction-pointer sampling during the Nsight Systems capture.

Source
The trace keeps the requested event domains without CPU sampling records.
Runtime / compiler
It changes profiler collection overhead and report contents, not workload semantics.
GPU execution
No GPU execution unit is selected.
Memory path
The option reports no tensor placement, transfer size, or HBM traffic.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 --force-overwrite=true \

This continuation argument allows the profiler to replace an existing output artifact at the chosen path.

Source
The capture does not stop merely because a prior file uses the same output name.
Runtime / compiler
It changes output-file handling only.
GPU execution
No GPU execution unit is selected.
Memory path
It changes host filesystem behavior, not GPU memory traffic.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 --output="$out/timeline" \

This continuation argument names the `timeline` output inside the receipt directory.

Source
Nsight Systems writes the captured artifact under the declared output prefix.
Runtime / compiler
It controls host artifact placement, not model dispatch.
GPU execution
No GPU execution unit is selected.
Memory path
The output path records no HBM movement until a real capture is produced.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 "$@"

This final shell line executes the exact command and arguments passed into the capture wrapper.

Source
The wrapper preserves argument boundaries and runs the caller-supplied target under Nsight Systems.
Runtime / compiler
The target command determines which engine, compiler, and workload paths actually execute.
GPU execution
Only the target's later dispatch can select kernels and GPU execution units.
Memory path
Only the target plus captured trace can establish tensor movement, cache behavior, or HBM traffic.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"

This line invokes `printf` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 printf '%q ' "$@" >> "$out/run.txt"

This line invokes `printf` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 printf '\n' >> "$out/run.txt"

This line invokes `printf` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 cat <<NOTE

This line invokes `cat` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 Captured $out/timeline.nsys-rep.

This line invokes `Captured` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Captured` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Run Nsight Compute only on a selected kernel, for example:

This line invokes `Run` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>

This line invokes `ncu` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ncu` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 Run correctness separately:

This line invokes `Run` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 compute-sanitizer --tool memcheck <kernel-test>

This line invokes `compute-sanitizer` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 compute-sanitizer --tool racecheck <kernel-test>

This line invokes `compute-sanitizer` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the CUPTI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

Revision: not supplied

shared operator bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is instrumentation.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nsight-systems Nsight Systems 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Nsight Systems

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  if [[ $# -lt 1 ]]; then
     E05    echo "usage: $0 command [args ...]" >&2
     E06    exit 2
     E07  fi
     E08
     E09  run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"
     E10  out="${ARTIFACT_DIR:-artifacts/$run_id}"
     E11  mkdir -p "$out"
     E12
     E13  nvidia-smi -q > "$out/nvidia-smi-q.txt"
     E14  nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"
     E15  dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true
     E16
     E17  nsys profile \
     E18    --trace=cuda,nvtx,osrt \
     E19    --sample=none \
     E20    --force-overwrite=true \
     E21    --output="$out/timeline" \
     E22    "$@"
     E23
     E24  printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"
     E25  printf '%q ' "$@" >> "$out/run.txt"
     E26  printf '\n' >> "$out/run.txt"
     E27
     E28  cat <<NOTE
     E29  Captured $out/timeline.nsys-rep.
     E30  Run Nsight Compute only on a selected kernel, for example:
     E31    ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>
     E32  Run correctness separately:
     E33    compute-sanitizer --tool memcheck <kernel-test>
     E34    compute-sanitizer --tool racecheck <kernel-test>
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `/usr/bin/env bash` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 if [[ $# -lt 1 ]]; then

This line selects a control path using `if [[ $# -lt 1 ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `if [[ $# -lt 1 ]]; then` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 echo "usage: $0 command [args ...]" >&2

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 exit 2

This line invokes `exit` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `exit` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 fi

This line invokes `fi` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"

This line binds or updates `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` for later source in Nsight Systems. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 out="${ARTIFACT_DIR:-artifacts/$run_id}"

This line binds or updates `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` for later source in Nsight Systems. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 mkdir -p "$out"

This line invokes `mkdir` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `mkdir` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 nvidia-smi -q > "$out/nvidia-smi-q.txt"

This command writes the selected NVIDIA device's detailed `nvidia-smi -q` inventory and telemetry snapshot to the receipt directory.

Source
The shell redirects the device query into `nvidia-smi-q.txt`.
Runtime / compiler
It captures host-visible device state and does not launch the target workload.
GPU execution
No workload kernel or execution unit is selected.
Memory path
The report can contain capacity and device telemetry, but it is not per-operation HBM traffic or same-run task energy by itself.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"

This command records the host-visible NVIDIA device topology matrix in the receipt directory.

Source
The shell redirects `nvidia-smi topo -m` output to `nvidia-smi-topo.txt`.
Runtime / compiler
It inventories possible peer and host paths; it does not prove that the workload used one.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
Topology labels constrain possible movement paths but do not report bytes, link use, HBM traffic, or timing.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true

This command records DCGM's discoverable GPU inventory and tolerates an unavailable DCGM installation.

Source
Output and errors go to `dcgm-discovery.txt`; `|| true` keeps the surrounding capture script running on failure.
Runtime / compiler
It probes monitoring availability and does not launch the model.
GPU execution
No workload execution unit is selected.
Memory path
Discovery proves no tensor placement, transfer, HBM traffic, power, or energy.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 nsys profile \

This command runs the declared target under Nsight Systems and requests the named trace domains.

Source
The CLI configures trace collection and an output artifact around the child process.
Runtime / compiler
Instrumentation can capture CUDA, NVTX, OS-runtime, and timing events and can add measurement overhead.
GPU execution
Profiler configuration does not select a workload kernel or GPU execution unit.
Memory path
A resulting trace may correlate transfers and kernels, but this command alone proves no tensor residency or HBM byte count.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 --trace=cuda,nvtx,osrt \

This continuation argument asks Nsight Systems to trace CUDA, NVTX, and OS-runtime events.

Source
The option configures which event domains appear in the generated timeline.
Runtime / compiler
Tracing wraps the later target command and can add collection overhead.
GPU execution
It observes API and timing events but does not select a workload kernel.
Memory path
The event domains can expose transfer calls, but counters and HBM bytes still require the captured trace.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 --sample=none \

This continuation argument disables periodic CPU instruction-pointer sampling during the Nsight Systems capture.

Source
The trace keeps the requested event domains without CPU sampling records.
Runtime / compiler
It changes profiler collection overhead and report contents, not workload semantics.
GPU execution
No GPU execution unit is selected.
Memory path
The option reports no tensor placement, transfer size, or HBM traffic.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 --force-overwrite=true \

This continuation argument allows the profiler to replace an existing output artifact at the chosen path.

Source
The capture does not stop merely because a prior file uses the same output name.
Runtime / compiler
It changes output-file handling only.
GPU execution
No GPU execution unit is selected.
Memory path
It changes host filesystem behavior, not GPU memory traffic.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 --output="$out/timeline" \

This continuation argument names the `timeline` output inside the receipt directory.

Source
Nsight Systems writes the captured artifact under the declared output prefix.
Runtime / compiler
It controls host artifact placement, not model dispatch.
GPU execution
No GPU execution unit is selected.
Memory path
The output path records no HBM movement until a real capture is produced.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 "$@"

This final shell line executes the exact command and arguments passed into the capture wrapper.

Source
The wrapper preserves argument boundaries and runs the caller-supplied target under Nsight Systems.
Runtime / compiler
The target command determines which engine, compiler, and workload paths actually execute.
GPU execution
Only the target's later dispatch can select kernels and GPU execution units.
Memory path
Only the target plus captured trace can establish tensor movement, cache behavior, or HBM traffic.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"

This line invokes `printf` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 printf '%q ' "$@" >> "$out/run.txt"

This line invokes `printf` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 printf '\n' >> "$out/run.txt"

This line invokes `printf` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 cat <<NOTE

This line invokes `cat` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 Captured $out/timeline.nsys-rep.

This line invokes `Captured` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Captured` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Run Nsight Compute only on a selected kernel, for example:

This line invokes `Run` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>

This line invokes `ncu` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ncu` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 Run correctness separately:

This line invokes `Run` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 compute-sanitizer --tool memcheck <kernel-test>

This line invokes `compute-sanitizer` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 compute-sanitizer --tool racecheck <kernel-test>

This line invokes `compute-sanitizer` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the Nsight Systems source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Host code can record a sample or compute an allocation after the declared function is executed.

What it means on the GPU

Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.

How bytes could move

Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.

Why this line could matter to useful work

This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

Revision: not supplied

shared power-cost bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is profiler.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nsight-compute Nsight Compute 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Nsight Compute

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  if [[ $# -lt 1 ]]; then
     E05    echo "usage: $0 command [args ...]" >&2
     E06    exit 2
     E07  fi
     E08
     E09  run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"
     E10  out="${ARTIFACT_DIR:-artifacts/$run_id}"
     E11  mkdir -p "$out"
     E12
     E13  nvidia-smi -q > "$out/nvidia-smi-q.txt"
     E14  nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"
     E15  dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true
     E16
     E17  nsys profile \
     E18    --trace=cuda,nvtx,osrt \
     E19    --sample=none \
     E20    --force-overwrite=true \
     E21    --output="$out/timeline" \
     E22    "$@"
     E23
     E24  printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"
     E25  printf '%q ' "$@" >> "$out/run.txt"
     E26  printf '\n' >> "$out/run.txt"
     E27
     E28  cat <<NOTE
     E29  Captured $out/timeline.nsys-rep.
     E30  Run Nsight Compute only on a selected kernel, for example:
     E31    ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>
     E32  Run correctness separately:
     E33    compute-sanitizer --tool memcheck <kernel-test>
     E34    compute-sanitizer --tool racecheck <kernel-test>
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `/usr/bin/env bash` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 if [[ $# -lt 1 ]]; then

This line selects a control path using `if [[ $# -lt 1 ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `if [[ $# -lt 1 ]]; then` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 echo "usage: $0 command [args ...]" >&2

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 exit 2

This line invokes `exit` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `exit` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 fi

This line invokes `fi` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"

This line binds or updates `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` for later source in Nsight Compute. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 out="${ARTIFACT_DIR:-artifacts/$run_id}"

This line binds or updates `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` for later source in Nsight Compute. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 mkdir -p "$out"

This line invokes `mkdir` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `mkdir` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 nvidia-smi -q > "$out/nvidia-smi-q.txt"

This command writes the selected NVIDIA device's detailed `nvidia-smi -q` inventory and telemetry snapshot to the receipt directory.

Source
The shell redirects the device query into `nvidia-smi-q.txt`.
Runtime / compiler
It captures host-visible device state and does not launch the target workload.
GPU execution
No workload kernel or execution unit is selected.
Memory path
The report can contain capacity and device telemetry, but it is not per-operation HBM traffic or same-run task energy by itself.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"

This command records the host-visible NVIDIA device topology matrix in the receipt directory.

Source
The shell redirects `nvidia-smi topo -m` output to `nvidia-smi-topo.txt`.
Runtime / compiler
It inventories possible peer and host paths; it does not prove that the workload used one.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
Topology labels constrain possible movement paths but do not report bytes, link use, HBM traffic, or timing.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true

This command records DCGM's discoverable GPU inventory and tolerates an unavailable DCGM installation.

Source
Output and errors go to `dcgm-discovery.txt`; `|| true` keeps the surrounding capture script running on failure.
Runtime / compiler
It probes monitoring availability and does not launch the model.
GPU execution
No workload execution unit is selected.
Memory path
Discovery proves no tensor placement, transfer, HBM traffic, power, or energy.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 nsys profile \

This command runs the declared target under Nsight Systems and requests the named trace domains.

Source
The CLI configures trace collection and an output artifact around the child process.
Runtime / compiler
Instrumentation can capture CUDA, NVTX, OS-runtime, and timing events and can add measurement overhead.
GPU execution
Profiler configuration does not select a workload kernel or GPU execution unit.
Memory path
A resulting trace may correlate transfers and kernels, but this command alone proves no tensor residency or HBM byte count.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 --trace=cuda,nvtx,osrt \

This continuation argument asks Nsight Systems to trace CUDA, NVTX, and OS-runtime events.

Source
The option configures which event domains appear in the generated timeline.
Runtime / compiler
Tracing wraps the later target command and can add collection overhead.
GPU execution
It observes API and timing events but does not select a workload kernel.
Memory path
The event domains can expose transfer calls, but counters and HBM bytes still require the captured trace.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 --sample=none \

This continuation argument disables periodic CPU instruction-pointer sampling during the Nsight Systems capture.

Source
The trace keeps the requested event domains without CPU sampling records.
Runtime / compiler
It changes profiler collection overhead and report contents, not workload semantics.
GPU execution
No GPU execution unit is selected.
Memory path
The option reports no tensor placement, transfer size, or HBM traffic.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 --force-overwrite=true \

This continuation argument allows the profiler to replace an existing output artifact at the chosen path.

Source
The capture does not stop merely because a prior file uses the same output name.
Runtime / compiler
It changes output-file handling only.
GPU execution
No GPU execution unit is selected.
Memory path
It changes host filesystem behavior, not GPU memory traffic.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 --output="$out/timeline" \

This continuation argument names the `timeline` output inside the receipt directory.

Source
Nsight Systems writes the captured artifact under the declared output prefix.
Runtime / compiler
It controls host artifact placement, not model dispatch.
GPU execution
No GPU execution unit is selected.
Memory path
The output path records no HBM movement until a real capture is produced.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 "$@"

This final shell line executes the exact command and arguments passed into the capture wrapper.

Source
The wrapper preserves argument boundaries and runs the caller-supplied target under Nsight Systems.
Runtime / compiler
The target command determines which engine, compiler, and workload paths actually execute.
GPU execution
Only the target's later dispatch can select kernels and GPU execution units.
Memory path
Only the target plus captured trace can establish tensor movement, cache behavior, or HBM traffic.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"

This line invokes `printf` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 printf '%q ' "$@" >> "$out/run.txt"

This line invokes `printf` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 printf '\n' >> "$out/run.txt"

This line invokes `printf` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 cat <<NOTE

This line invokes `cat` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 Captured $out/timeline.nsys-rep.

This line invokes `Captured` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Captured` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Run Nsight Compute only on a selected kernel, for example:

This line invokes `Run` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>

This line invokes `ncu` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ncu` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 Run correctness separately:

This line invokes `Run` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 compute-sanitizer --tool memcheck <kernel-test>

This line invokes `compute-sanitizer` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 compute-sanitizer --tool racecheck <kernel-test>

This line invokes `compute-sanitizer` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the Nsight Compute source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Host code can record a sample or compute an allocation after the declared function is executed.

What it means on the GPU

Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.

How bytes could move

Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.

Why this line could matter to useful work

This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

Revision: not supplied

shared power-cost bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is kernel_profiler.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

compute-sanitizer Compute Sanitizer 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Compute Sanitizer

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  if [[ $# -lt 1 ]]; then
     E05    echo "usage: $0 command [args ...]" >&2
     E06    exit 2
     E07  fi
     E08
     E09  run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"
     E10  out="${ARTIFACT_DIR:-artifacts/$run_id}"
     E11  mkdir -p "$out"
     E12
     E13  nvidia-smi -q > "$out/nvidia-smi-q.txt"
     E14  nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"
     E15  dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true
     E16
     E17  nsys profile \
     E18    --trace=cuda,nvtx,osrt \
     E19    --sample=none \
     E20    --force-overwrite=true \
     E21    --output="$out/timeline" \
     E22    "$@"
     E23
     E24  printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"
     E25  printf '%q ' "$@" >> "$out/run.txt"
     E26  printf '\n' >> "$out/run.txt"
     E27
     E28  cat <<NOTE
     E29  Captured $out/timeline.nsys-rep.
     E30  Run Nsight Compute only on a selected kernel, for example:
     E31    ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>
     E32  Run correctness separately:
     E33    compute-sanitizer --tool memcheck <kernel-test>
     E34    compute-sanitizer --tool racecheck <kernel-test>
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 if [[ $# -lt 1 ]]; then

This line selects a control path using `if [[ $# -lt 1 ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ $# -lt 1 ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 echo "usage: $0 command [args ...]" >&2

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 exit 2

This line invokes `exit` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `exit` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 fi

This line invokes `fi` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"

This line binds or updates `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` for later source in Compute Sanitizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 out="${ARTIFACT_DIR:-artifacts/$run_id}"

This line binds or updates `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` for later source in Compute Sanitizer. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 mkdir -p "$out"

This line invokes `mkdir` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `mkdir` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 nvidia-smi -q > "$out/nvidia-smi-q.txt"

This command writes the selected NVIDIA device's detailed `nvidia-smi -q` inventory and telemetry snapshot to the receipt directory.

Source
The shell redirects the device query into `nvidia-smi-q.txt`.
Runtime / compiler
It captures host-visible device state and does not launch the target workload.
GPU execution
No workload kernel or execution unit is selected.
Memory path
The report can contain capacity and device telemetry, but it is not per-operation HBM traffic or same-run task energy by itself.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"

This command records the host-visible NVIDIA device topology matrix in the receipt directory.

Source
The shell redirects `nvidia-smi topo -m` output to `nvidia-smi-topo.txt`.
Runtime / compiler
It inventories possible peer and host paths; it does not prove that the workload used one.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
Topology labels constrain possible movement paths but do not report bytes, link use, HBM traffic, or timing.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true

This command records DCGM's discoverable GPU inventory and tolerates an unavailable DCGM installation.

Source
Output and errors go to `dcgm-discovery.txt`; `|| true` keeps the surrounding capture script running on failure.
Runtime / compiler
It probes monitoring availability and does not launch the model.
GPU execution
No workload execution unit is selected.
Memory path
Discovery proves no tensor placement, transfer, HBM traffic, power, or energy.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 nsys profile \

This command runs the declared target under Nsight Systems and requests the named trace domains.

Source
The CLI configures trace collection and an output artifact around the child process.
Runtime / compiler
Instrumentation can capture CUDA, NVTX, OS-runtime, and timing events and can add measurement overhead.
GPU execution
Profiler configuration does not select a workload kernel or GPU execution unit.
Memory path
A resulting trace may correlate transfers and kernels, but this command alone proves no tensor residency or HBM byte count.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 --trace=cuda,nvtx,osrt \

This continuation argument asks Nsight Systems to trace CUDA, NVTX, and OS-runtime events.

Source
The option configures which event domains appear in the generated timeline.
Runtime / compiler
Tracing wraps the later target command and can add collection overhead.
GPU execution
It observes API and timing events but does not select a workload kernel.
Memory path
The event domains can expose transfer calls, but counters and HBM bytes still require the captured trace.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 --sample=none \

This continuation argument disables periodic CPU instruction-pointer sampling during the Nsight Systems capture.

Source
The trace keeps the requested event domains without CPU sampling records.
Runtime / compiler
It changes profiler collection overhead and report contents, not workload semantics.
GPU execution
No GPU execution unit is selected.
Memory path
The option reports no tensor placement, transfer size, or HBM traffic.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 --force-overwrite=true \

This continuation argument allows the profiler to replace an existing output artifact at the chosen path.

Source
The capture does not stop merely because a prior file uses the same output name.
Runtime / compiler
It changes output-file handling only.
GPU execution
No GPU execution unit is selected.
Memory path
It changes host filesystem behavior, not GPU memory traffic.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 --output="$out/timeline" \

This continuation argument names the `timeline` output inside the receipt directory.

Source
Nsight Systems writes the captured artifact under the declared output prefix.
Runtime / compiler
It controls host artifact placement, not model dispatch.
GPU execution
No GPU execution unit is selected.
Memory path
The output path records no HBM movement until a real capture is produced.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 "$@"

This final shell line executes the exact command and arguments passed into the capture wrapper.

Source
The wrapper preserves argument boundaries and runs the caller-supplied target under Nsight Systems.
Runtime / compiler
The target command determines which engine, compiler, and workload paths actually execute.
GPU execution
Only the target's later dispatch can select kernels and GPU execution units.
Memory path
Only the target plus captured trace can establish tensor movement, cache behavior, or HBM traffic.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"

This line invokes `printf` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 printf '%q ' "$@" >> "$out/run.txt"

This line invokes `printf` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 printf '\n' >> "$out/run.txt"

This line invokes `printf` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 cat <<NOTE

This line invokes `cat` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 Captured $out/timeline.nsys-rep.

This line invokes `Captured` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Captured` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Run Nsight Compute only on a selected kernel, for example:

This line invokes `Run` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>

This line invokes `ncu` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ncu` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 Run correctness separately:

This line invokes `Run` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 compute-sanitizer --tool memcheck <kernel-test>

This line invokes `compute-sanitizer` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 compute-sanitizer --tool racecheck <kernel-test>

This line invokes `compute-sanitizer` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the Compute Sanitizer source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is correctness_tool.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvml NVML 68 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVML

python

REGISTERED SOURCE · 68 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/05-evidence/nvml_sample.py

     E01  #!/usr/bin/env python3
     E02  """Timestamped NVML sampling with power-rate and energy kept distinct."""
     E03
     E04  from __future__ import annotations
     E05
     E06  import argparse
     E07  import json
     E08  import time
     E09
     E10  import pynvml
     E11
     E12
     E13  def main() -> None:
     E14      parser = argparse.ArgumentParser()
     E15      parser.add_argument("--seconds", type=float, default=5.0)
     E16      parser.add_argument("--interval", type=float, default=0.1)
     E17      args = parser.parse_args()
     E18
     E19      pynvml.nvmlInit()
     E20      handle = pynvml.nvmlDeviceGetHandleByIndex(0)
     E21      start = time.monotonic()
     E22      previous_t = start
     E23      previous_watts = pynvml.nvmlDeviceGetPowerUsage(handle) / 1_000.0
     E24      integrated_joules = 0.0
     E25      samples: list[dict[str, float]] = []
     E26
     E27      try:
     E28          start_energy_mj = pynvml.nvmlDeviceGetTotalEnergyConsumption(handle)
     E29      except pynvml.NVMLError:
     E30          start_energy_mj = None
     E31
     E32      while True:
     E33          time.sleep(args.interval)
     E34          now = time.monotonic()
     E35          watts = pynvml.nvmlDeviceGetPowerUsage(handle) / 1_000.0
     E36          integrated_joules += 0.5 * (previous_watts + watts) * (now - previous_t)
     E37          samples.append({"t_s": now - start, "power_W": watts})
     E38          previous_t, previous_watts = now, watts
     E39          if now - start >= args.seconds:
     E40              break
     E41
     E42      try:
     E43          end_energy_mj = pynvml.nvmlDeviceGetTotalEnergyConsumption(handle)
     E44      except pynvml.NVMLError:
     E45          end_energy_mj = None
     E46
     E47      pynvml.nvmlShutdown()
     E48      print(
     E49          json.dumps(
     E50              {
     E51                  "boundary": "gpu_device_not_rack_or_facility",
     E52                  "sample_interval_requested_s": args.interval,
     E53                  "integrated_sampled_energy_J": integrated_joules,
     E54                  "device_counter_energy_J": (
     E55                      (end_energy_mj - start_energy_mj) / 1_000.0
     E56                      if start_energy_mj is not None and end_energy_mj is not None
     E57                      else None
     E58                  ),
     E59                  "samples": samples,
     E60              },
     E61              indent=2,
     E62          )
     E63      )
     E64
     E65
     E66  if __name__ == "__main__":
     E67      main()
     E68  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 68 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env python3

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 """Timestamped NVML sampling with power-rate and energy kept distinct."""

This documentation line explains `Timestamped NVML sampling with power-rate and energy kept distinct.`; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line contributes timing evidence rather than useful model work. A trustworthy interval can turn kernel or transfer behavior into latency, throughput, energy, and cost denominators when it is joined to the same accepted output.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 from __future__ import annotations

This line imports `from __future__ import annotations` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `from __future__ import annotations` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 import argparse

This line imports `import argparse` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `import argparse` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 import json

This line imports `import json` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `import json` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 import time

This line imports `import time` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `import time` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 import pynvml

This line imports `import pynvml` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `import pynvml` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 def main() -> None:

This line begins the `main` callable contract used by NVML; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `main` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 parser = argparse.ArgumentParser()

This line calls `argparse.ArgumentParser(...)` and binds its returned value to `parser` for later use in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `parser ← argparse.ArgumentParser(...)` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 parser.add_argument("--seconds", type=float, default=5.0)

This line binds or updates `type = float, default=5.0)` for later source in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `type = float, default=5.0)` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 parser.add_argument("--interval", type=float, default=0.1)

This line binds or updates `type = float, default=0.1)` for later source in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `type = float, default=0.1)` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 args = parser.parse_args()

This line calls `parser.parse_args(...)` and binds its returned value to `args` for later use in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `args ← parser.parse_args(...)` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 pynvml.nvmlInit()

This line initializes the NVML client library before any device telemetry query.

Source
The Python process opens NVML state needed by later handle and metric calls.
Runtime / compiler
It initializes host telemetry access; it does not initialize the model runtime or compile device code.
GPU execution
No GPU execution unit is selected.
Memory path
No capacity, bandwidth, HBM traffic, power, energy, or cost is measured by initialization.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 handle = pynvml.nvmlDeviceGetHandleByIndex(0)

This line resolves GPU index 0 to the NVML device handle used by the later telemetry samples.

Source
The returned opaque handle identifies the parent device for subsequent NVML calls.
Runtime / compiler
This is host-side device selection for telemetry, not serving-engine placement.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
Selecting a device handle does not measure that device's HBM residency, traffic, power, or task attribution.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 start = time.monotonic()

This line calls `time.monotonic(...)` and binds its returned value to `start` for later use in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `start ← time.monotonic(...)` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 previous_t = start

This line binds or updates `previous_t = start` for later source in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `previous_t = start` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 previous_watts = pynvml.nvmlDeviceGetPowerUsage(handle) / 1_000.0

This line samples the parent device's instantaneous NVML power reading and converts milliwatts to watts.

Source
The Python binding asks NVML for one power sample from the selected device handle.
Runtime / compiler
The host records telemetry; it does not change model scheduling or compile a kernel.
GPU execution
The sample is device-level telemetry and is not attributed to an SM, tensor core, memory controller, or HBM stack.
Memory path
It is power, not task energy, HBM-only power, cooling, water, or cost; time integration and allocation to the same run are required.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 integrated_joules = 0.0

This line binds or updates `integrated_joules = 0.0` for later source in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `integrated_joules = 0.0` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 samples: list[dict[str, float]] = []

This line binds or updates `float]] = []` for later source in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `float]] = []` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 try:

This continuation line declares or passes `try:` as part of the surrounding call or signature in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `try:` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 start_energy_mj = pynvml.nvmlDeviceGetTotalEnergyConsumption(handle)

This line calls `pynvml.nvmlDeviceGetTotalEnergyConsumption(...)` and binds its returned value to `start_energy_mj` for later use in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `start_energy_mj ← pynvml.nvmlDeviceGetTotalEnergyConsumption(...)` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 except pynvml.NVMLError:

This exact expression `except pynvml.NVMLError:` contributes to the surrounding NVML statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `except pynvml.NVMLError:` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 start_energy_mj = None

This line binds or updates `start_energy_mj = None` for later source in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `start_energy_mj = None` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 while True:

This line begins the repeated control path `while True:` inside NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `while True:` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 time.sleep(args.interval)

This line invokes the call chain `time.sleep` when NVML executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `time.sleep` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 now = time.monotonic()

This line calls `time.monotonic(...)` and binds its returned value to `now` for later use in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `now ← time.monotonic(...)` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 watts = pynvml.nvmlDeviceGetPowerUsage(handle) / 1_000.0

This line samples the parent device's instantaneous NVML power reading and converts milliwatts to watts.

Source
The Python binding asks NVML for one power sample from the selected device handle.
Runtime / compiler
The host records telemetry; it does not change model scheduling or compile a kernel.
GPU execution
The sample is device-level telemetry and is not attributed to an SM, tensor core, memory controller, or HBM stack.
Memory path
It is power, not task energy, HBM-only power, cooling, water, or cost; time integration and allocation to the same run are required.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 integrated_joules += 0.5 * (previous_watts + watts) * (now - previous_t)

This exact expression `integrated_joules += 0.5 * (previous_watts + watts) * (now - previous_t)` contributes to the surrounding NVML statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `integrated_joules += 0.5 * (previous_watts + watts) * (now - previous_t)` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 samples.append({"t_s": now - start, "power_W": watts})

This continuation line declares or passes `samples.append({"t_s": now - start, "power_W": watts})` as part of the surrounding call or signature in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `samples.append({"t_s": now - start, "power_W": watts})` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 previous_t, previous_watts = now, watts

This line binds or updates `previous_watts = now, watts` for later source in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `previous_watts = now, watts` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 if now - start >= args.seconds:

This line selects a control path using `if now - start >= args.seconds:` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `if now - start >= args.seconds:` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 break

This exact expression `break` contributes to the surrounding NVML statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `break` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This continuation line declares or passes `try:` as part of the surrounding call or signature in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `try:` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 end_energy_mj = pynvml.nvmlDeviceGetTotalEnergyConsumption(handle)

This line calls `pynvml.nvmlDeviceGetTotalEnergyConsumption(...)` and binds its returned value to `end_energy_mj` for later use in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `end_energy_mj ← pynvml.nvmlDeviceGetTotalEnergyConsumption(...)` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except pynvml.NVMLError:

This exact expression `except pynvml.NVMLError:` contributes to the surrounding NVML statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `except pynvml.NVMLError:` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 end_energy_mj = None

This line binds or updates `end_energy_mj = None` for later source in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `end_energy_mj = None` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 pynvml.nvmlShutdown()

This line closes the process's NVML client state after the samples have been collected.

Source
The Python binding releases NVML resources held by the process.
Runtime / compiler
It ends host telemetry access and does not stop the model runtime or reset the GPU.
GPU execution
No GPU execution unit is selected.
Memory path
It releases client state, not model tensors or HBM allocations, and records no traffic or energy.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 print(

This line invokes the call chain `print` when NVML executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `print` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 json.dumps(

This line invokes the call chain `json.dumps` when NVML executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `json.dumps` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 {

This exact expression `{` contributes to the surrounding NVML statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `{` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 "boundary": "gpu_device_not_rack_or_facility",

This line declares `boundary = "gpu_device_not_rack_or_facility"` as an exact configuration value used by NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `boundary = "gpu_device_not_rack_or_facility"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 "sample_interval_requested_s": args.interval,

This line declares `sample_interval_requested_s = args.interval` as an exact configuration value used by NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `sample_interval_requested_s = args.interval` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 "integrated_sampled_energy_J": integrated_joules,

This line declares `integrated_sampled_energy_J = integrated_joules` as an exact configuration value used by NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `integrated_sampled_energy_J = integrated_joules` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 "device_counter_energy_J": (

This line declares `device_counter_energy_J = (` as an exact configuration value used by NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `device_counter_energy_J = (` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 (end_energy_mj - start_energy_mj) / 1_000.0

This exact expression `(end_energy_mj - start_energy_mj) / 1_000.0` contributes to the surrounding NVML statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `(end_energy_mj - start_energy_mj) / 1_000.0` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 if start_energy_mj is not None and end_energy_mj is not None

This line selects a control path using `if start_energy_mj is not None and end_energy_mj is not None` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `if start_energy_mj is not None and end_energy_mj is not None` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line participates in resource accounting. It becomes decision-grade only when the declared measurement boundary, synchronized time window, price or asset model, failures, and accepted-output count share the same run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 else None

This line selects a control path using `else None` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `else None` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 ),

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 "samples": samples,

This line declares `samples = samples` as an exact configuration value used by NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `samples = samples` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 },

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E61 indent=2,

This line binds or updates `indent = 2,` for later source in NVML. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `indent = 2,` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E62 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E63 )

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E64 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E65 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E66 if __name__ == "__main__":

This line selects a control path using `if __name__ == "__main__":` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `if __name__ == "__main__":` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E67 main()

This line invokes the call chain `main` when NVML executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `main` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E68 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 68 Read this exact line
#!/usr/bin/env python3
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `!/usr/bin/env python3` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/05-evidence/nvml_sample.py

Revision: not supplied

shared power-cost python coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This python excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is telemetry_api.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

dcgm DCGM 36 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

DCGM

bash

REGISTERED SOURCE · 36 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  if [[ $# -lt 1 ]]; then
     E05    echo "usage: $0 command [args ...]" >&2
     E06    exit 2
     E07  fi
     E08
     E09  run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"
     E10  out="${ARTIFACT_DIR:-artifacts/$run_id}"
     E11  mkdir -p "$out"
     E12
     E13  nvidia-smi -q > "$out/nvidia-smi-q.txt"
     E14  nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"
     E15  dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true
     E16
     E17  nsys profile \
     E18    --trace=cuda,nvtx,osrt \
     E19    --sample=none \
     E20    --force-overwrite=true \
     E21    --output="$out/timeline" \
     E22    "$@"
     E23
     E24  printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"
     E25  printf '%q ' "$@" >> "$out/run.txt"
     E26  printf '\n' >> "$out/run.txt"
     E27
     E28  cat <<NOTE
     E29  Captured $out/timeline.nsys-rep.
     E30  Run Nsight Compute only on a selected kernel, for example:
     E31    ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>
     E32  Run correctness separately:
     E33    compute-sanitizer --tool memcheck <kernel-test>
     E34    compute-sanitizer --tool racecheck <kernel-test>
     E35  NOTE
     E36  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 36 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `/usr/bin/env bash` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 if [[ $# -lt 1 ]]; then

This line selects a control path using `if [[ $# -lt 1 ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `if [[ $# -lt 1 ]]; then` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 echo "usage: $0 command [args ...]" >&2

This is an authored omission marker, not source code. It makes the partial excerpt explicit instead of pretending the skipped lines are present. The excerpt line is exact, but the upstream file line number is not registered.

Source
This marker declares that source was omitted from the excerpt; it is not executable code.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 exit 2

This line invokes `exit` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `exit` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 fi

This line invokes `fi` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 run_id="${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"

This line binds or updates `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` for later source in DCGM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `run_id = "${RUN_ID:-$(date -u +%Y%m%dT%H%M%SZ)-unverified}"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 out="${ARTIFACT_DIR:-artifacts/$run_id}"

This line binds or updates `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` for later source in DCGM. The excerpt line is exact, but the upstream file line number is not registered.

Source
The resource-accounting layer uses `out = "${ARTIFACT_DIR:-artifacts/$run_id}"` to sample, normalize, or join telemetry and cost inputs.
Runtime / compiler
Host code can record a sample or compute an allocation after the declared function is executed.
GPU execution
Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.
Memory path
Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 mkdir -p "$out"

This line invokes `mkdir` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `mkdir` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 nvidia-smi -q > "$out/nvidia-smi-q.txt"

This command writes the selected NVIDIA device's detailed `nvidia-smi -q` inventory and telemetry snapshot to the receipt directory.

Source
The shell redirects the device query into `nvidia-smi-q.txt`.
Runtime / compiler
It captures host-visible device state and does not launch the target workload.
GPU execution
No workload kernel or execution unit is selected.
Memory path
The report can contain capacity and device telemetry, but it is not per-operation HBM traffic or same-run task energy by itself.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 nvidia-smi topo -m > "$out/nvidia-smi-topo.txt"

This command records the host-visible NVIDIA device topology matrix in the receipt directory.

Source
The shell redirects `nvidia-smi topo -m` output to `nvidia-smi-topo.txt`.
Runtime / compiler
It inventories possible peer and host paths; it does not prove that the workload used one.
GPU execution
No kernel or GPU execution unit is selected.
Memory path
Topology labels constrain possible movement paths but do not report bytes, link use, HBM traffic, or timing.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 dcgmi discovery -l > "$out/dcgm-discovery.txt" 2>&1 || true

This command records DCGM's discoverable GPU inventory and tolerates an unavailable DCGM installation.

Source
Output and errors go to `dcgm-discovery.txt`; `|| true` keeps the surrounding capture script running on failure.
Runtime / compiler
It probes monitoring availability and does not launch the model.
GPU execution
No workload execution unit is selected.
Memory path
Discovery proves no tensor placement, transfer, HBM traffic, power, or energy.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 nsys profile \

This command runs the declared target under Nsight Systems and requests the named trace domains.

Source
The CLI configures trace collection and an output artifact around the child process.
Runtime / compiler
Instrumentation can capture CUDA, NVTX, OS-runtime, and timing events and can add measurement overhead.
GPU execution
Profiler configuration does not select a workload kernel or GPU execution unit.
Memory path
A resulting trace may correlate transfers and kernels, but this command alone proves no tensor residency or HBM byte count.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 --trace=cuda,nvtx,osrt \

This continuation argument asks Nsight Systems to trace CUDA, NVTX, and OS-runtime events.

Source
The option configures which event domains appear in the generated timeline.
Runtime / compiler
Tracing wraps the later target command and can add collection overhead.
GPU execution
It observes API and timing events but does not select a workload kernel.
Memory path
The event domains can expose transfer calls, but counters and HBM bytes still require the captured trace.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 --sample=none \

This continuation argument disables periodic CPU instruction-pointer sampling during the Nsight Systems capture.

Source
The trace keeps the requested event domains without CPU sampling records.
Runtime / compiler
It changes profiler collection overhead and report contents, not workload semantics.
GPU execution
No GPU execution unit is selected.
Memory path
The option reports no tensor placement, transfer size, or HBM traffic.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 --force-overwrite=true \

This continuation argument allows the profiler to replace an existing output artifact at the chosen path.

Source
The capture does not stop merely because a prior file uses the same output name.
Runtime / compiler
It changes output-file handling only.
GPU execution
No GPU execution unit is selected.
Memory path
It changes host filesystem behavior, not GPU memory traffic.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 --output="$out/timeline" \

This continuation argument names the `timeline` output inside the receipt directory.

Source
Nsight Systems writes the captured artifact under the declared output prefix.
Runtime / compiler
It controls host artifact placement, not model dispatch.
GPU execution
No GPU execution unit is selected.
Memory path
The output path records no HBM movement until a real capture is produced.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 "$@"

This final shell line executes the exact command and arguments passed into the capture wrapper.

Source
The wrapper preserves argument boundaries and runs the caller-supplied target under Nsight Systems.
Runtime / compiler
The target command determines which engine, compiler, and workload paths actually execute.
GPU execution
Only the target's later dispatch can select kernels and GPU execution units.
Memory path
Only the target plus captured trace can establish tensor movement, cache behavior, or HBM traffic.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 printf 'run_id=%s\ncommand=' "$run_id" > "$out/run.txt"

This line invokes `printf` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 printf '%q ' "$@" >> "$out/run.txt"

This line invokes `printf` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 printf '\n' >> "$out/run.txt"

This line invokes `printf` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `printf` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 cat <<NOTE

This line invokes `cat` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 Captured $out/timeline.nsys-rep.

This line invokes `Captured` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Captured` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 Run Nsight Compute only on a selected kernel, for example:

This line invokes `Run` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 ncu --set full --kernel-name regex:<name> --export $out/kernel -- <command>

This line invokes `ncu` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ncu` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 Run correctness separately:

This line invokes `Run` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Run` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 compute-sanitizer --tool memcheck <kernel-test>

This line invokes `compute-sanitizer` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 compute-sanitizer --tool racecheck <kernel-test>

This line invokes `compute-sanitizer` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `compute-sanitizer` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 NOTE

This line invokes `NOTE` in the DCGM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 36 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Host code can record a sample or compute an allocation after the declared function is executed.

What it means on the GPU

Resource accounting is not a kernel dispatch and is not automatically attributable to a particular GPU unit.

How bytes could move

Capacity, instantaneous power, energy, cooling, water, and cost are distinct quantities and require time alignment plus a same-run allocation boundary.

Why this line could matter to useful work

This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/05-evidence/capture.sh

Revision: not supplied

shared power-cost bash coverage: parser_only observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is fleet_telemetry.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvidia-smi nvidia-smi 38 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

nvidia-smi

bash

REGISTERED SOURCE · 38 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/00-environment/detect.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  # Read-only environment receipt. This script never selects an architecture by
     E05  # product nickname; it asks the installed driver and toolkit.
     E06
     E07  command -v nvidia-smi >/dev/null && nvidia-smi --query-gpu=index,name,uuid,driver_version,compute_cap,pci.bus_id,memory.total --format=csv,noheader || true
     E08  command -v nvcc >/dev/null && nvcc --version || true
     E09  command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true
     E10  command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true
     E11  command -v dcgmi >/dev/null && dcgmi discovery -l || true
     E12
     E13  python3 - <<'PY'
     E14  import importlib.metadata as metadata
     E15  import json
     E16
     E17  packages = [
     E18      "torch",
     E19      "triton",
     E20      "flashinfer-python",
     E21      "transformer-engine",
     E22      "nvidia-modelopt",
     E23      "vllm",
     E24      "sglang",
     E25      "lmcache",
     E26      "tensorrt-llm",
     E27      "ai-dynamo",
     E28      "nixl",
     E29  ]
     E30  versions = {}
     E31  for package in packages:
     E32      try:
     E33          versions[package] = metadata.version(package)
     E34      except metadata.PackageNotFoundError:
     E35          versions[package] = None
     E36  print(json.dumps(versions, indent=2, sort_keys=True))
     E37  PY
     E38  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 38 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the nvidia-smi source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 # Read-only environment receipt. This script never selects an architecture by

This comment documents `Read-only environment receipt. This script never selects an architecture by` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 # product nickname; it asks the installed driver and toolkit.

This comment documents `product nickname; it asks the installed driver and toolkit.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 command -v nvidia-smi >/dev/null && nvidia-smi --query-gpu=index,name,uuid,driver_version,compute_cap,pci.bus_id,memory.total --format=csv,noheader || true

This line invokes `command` in the nvidia-smi source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 command -v nvcc >/dev/null && nvcc --version || true

This line invokes `command` in the nvidia-smi source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true

This line invokes `command` in the nvidia-smi source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true

This line invokes `command` in the nvidia-smi source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 command -v dcgmi >/dev/null && dcgmi discovery -l || true

This line invokes `command` in the nvidia-smi source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 python3 - <<'PY'

This line invokes `python3` in the nvidia-smi source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 import json

This line imports `import json` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import json` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 packages = [

This line binds or updates `packages = [` for later source in nvidia-smi. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = [` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 "torch",

This exact expression `"torch",` contributes to the surrounding nvidia-smi statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"torch",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 "triton",

This exact expression `"triton",` contributes to the surrounding nvidia-smi statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"triton",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 "flashinfer-python",

This exact expression `"flashinfer-python",` contributes to the surrounding nvidia-smi statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"flashinfer-python",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 "transformer-engine",

This exact expression `"transformer-engine",` contributes to the surrounding nvidia-smi statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"transformer-engine",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 "nvidia-modelopt",

This exact expression `"nvidia-modelopt",` contributes to the surrounding nvidia-smi statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"nvidia-modelopt",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 "vllm",

This exact expression `"vllm",` contributes to the surrounding nvidia-smi statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"vllm",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 "sglang",

This exact expression `"sglang",` contributes to the surrounding nvidia-smi statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"sglang",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 "lmcache",

This exact expression `"lmcache",` contributes to the surrounding nvidia-smi statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"lmcache",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 "tensorrt-llm",

This exact expression `"tensorrt-llm",` contributes to the surrounding nvidia-smi statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"tensorrt-llm",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 "ai-dynamo",

This exact expression `"ai-dynamo",` contributes to the surrounding nvidia-smi statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"ai-dynamo",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 "nixl",

This exact expression `"nixl",` contributes to the surrounding nvidia-smi statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"nixl",` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 ]

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 versions = {}

This line binds or updates `versions = {}` for later source in nvidia-smi. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `versions = {}` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 for package in packages:

This line begins the repeated control path `for package in packages:` inside nvidia-smi. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for package in packages:` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 try:

This line invokes `try:` in the nvidia-smi source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 versions[package] = metadata.version(package)

This line calls `metadata.version(...)` and binds its returned value to `versions[package]` for later use in nvidia-smi. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `versions[package] ← metadata.version(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 except metadata.PackageNotFoundError:

This line invokes `except` in the nvidia-smi source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 versions[package] = None

This line binds or updates `versions[package] = None` for later source in nvidia-smi. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `versions[package] = None` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 print(json.dumps(versions, indent=2, sort_keys=True))

This line binds or updates `indent = 2, sort_keys=True))` for later source in nvidia-smi. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `indent = 2, sort_keys=True))` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 PY

This line invokes `PY` in the nvidia-smi source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 38 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/00-environment/detect.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is operator_cli.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

doca DOCA 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

DOCA

bash

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true
     E05  command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true
     E06  command -v kubectl >/dev/null && kubectl version --client || true
     E07  command -v helm >/dev/null && helm version --short || true
     E08
     E09  if [[ -n "${NGC_IMAGE:-}" ]]; then
     E10    docker pull "$NGC_IMAGE"
     E11    docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'
     E12  else
     E13    echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"
     E14  fi
     E15
     E16  if command -v kubectl >/dev/null; then
     E17    kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true
     E18    kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true
     E19    kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true
     E20  fi
     E21
     E22  if command -v nvidia-smi >/dev/null; then
     E23    nvidia-smi -L
     E24    nvidia-smi mig -lgip 2>/dev/null || true
     E25    nvidia-smi compute-mode --query 2>/dev/null || true
     E26  fi
     E27
     E28  test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"
     E29
     E30  cat <<'NOTE'
     E31  GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment
     E32  or isolation facilities. Their presence is not evidence that the selected
     E33  inference request used them.
     E34  NOTE
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true

This line invokes `command` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true

This line invokes `command` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v kubectl >/dev/null && kubectl version --client || true

This line invokes `command` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 command -v helm >/dev/null && helm version --short || true

This line invokes `command` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if [[ -n "${NGC_IMAGE:-}" ]]; then

This line selects a control path using `if [[ -n "${NGC_IMAGE:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NGC_IMAGE:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 docker pull "$NGC_IMAGE"

This line invokes `docker` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'

This line invokes `docker` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"

This line invokes `echo` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 fi

This line invokes `fi` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 if command -v kubectl >/dev/null; then

This line selects a control path using `if command -v kubectl >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v kubectl >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true

This line invokes `kubectl` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true

This line invokes `kubectl` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true

This line binds or updates `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` for later source in DOCA. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 fi

This line invokes `fi` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 if command -v nvidia-smi >/dev/null; then

This line selects a control path using `if command -v nvidia-smi >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v nvidia-smi >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 nvidia-smi -L

This line invokes `nvidia-smi` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 nvidia-smi mig -lgip 2>/dev/null || true

This line invokes `nvidia-smi` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvidia-smi compute-mode --query 2>/dev/null || true

This line invokes `nvidia-smi` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 fi

This line invokes `fi` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"

This line invokes `test` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 cat <<'NOTE'

This line invokes `cat` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment

This line invokes `GPU` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `GPU` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 or isolation facilities. Their presence is not evidence that the selected

This line invokes `or` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `or` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 inference request used them.

This line invokes `inference` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `inference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 NOTE

This line invokes `NOTE` in the DOCA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

Revision: not supplied

shared operator bash coverage: not_started observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is dpu_sdk.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=not_started and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

bluefield BlueField DPU 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

BlueField DPU

bash

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true
     E05  command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true
     E06  command -v kubectl >/dev/null && kubectl version --client || true
     E07  command -v helm >/dev/null && helm version --short || true
     E08
     E09  if [[ -n "${NGC_IMAGE:-}" ]]; then
     E10    docker pull "$NGC_IMAGE"
     E11    docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'
     E12  else
     E13    echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"
     E14  fi
     E15
     E16  if command -v kubectl >/dev/null; then
     E17    kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true
     E18    kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true
     E19    kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true
     E20  fi
     E21
     E22  if command -v nvidia-smi >/dev/null; then
     E23    nvidia-smi -L
     E24    nvidia-smi mig -lgip 2>/dev/null || true
     E25    nvidia-smi compute-mode --query 2>/dev/null || true
     E26  fi
     E27
     E28  test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"
     E29
     E30  cat <<'NOTE'
     E31  GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment
     E32  or isolation facilities. Their presence is not evidence that the selected
     E33  inference request used them.
     E34  NOTE
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true

This line invokes `command` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true

This line invokes `command` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v kubectl >/dev/null && kubectl version --client || true

This line invokes `command` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 command -v helm >/dev/null && helm version --short || true

This line invokes `command` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if [[ -n "${NGC_IMAGE:-}" ]]; then

This line selects a control path using `if [[ -n "${NGC_IMAGE:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NGC_IMAGE:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 docker pull "$NGC_IMAGE"

This line invokes `docker` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'

This line invokes `docker` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"

This line invokes `echo` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 fi

This line invokes `fi` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 if command -v kubectl >/dev/null; then

This line selects a control path using `if command -v kubectl >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v kubectl >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true

This line invokes `kubectl` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true

This line invokes `kubectl` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true

This line binds or updates `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` for later source in BlueField DPU. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 fi

This line invokes `fi` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 if command -v nvidia-smi >/dev/null; then

This line selects a control path using `if command -v nvidia-smi >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v nvidia-smi >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 nvidia-smi -L

This line invokes `nvidia-smi` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 nvidia-smi mig -lgip 2>/dev/null || true

This line invokes `nvidia-smi` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvidia-smi compute-mode --query 2>/dev/null || true

This line invokes `nvidia-smi` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 fi

This line invokes `fi` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"

This line invokes `test` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 cat <<'NOTE'

This line invokes `cat` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment

This line invokes `GPU` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `GPU` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 or isolation facilities. Their presence is not evidence that the selected

This line invokes `or` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `or` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 inference request used them.

This line invokes `inference` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `inference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 NOTE

This line invokes `NOTE` in the BlueField DPU source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

Revision: not supplied

shared operator bash coverage: not_started observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is hardware_dpu.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=not_started and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

ucx UCX 30 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

UCX

bash

REGISTERED SOURCE · 30 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true
     E05  command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true
     E06  command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true
     E07
     E08  if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then
     E09    "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E10    if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then
     E11      "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E12    fi
     E13  else
     E14    echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"
     E15  fi
     E16
     E17  for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do
     E18    if command -v "$tool" >/dev/null; then
     E19      "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true
     E20    else
     E21      echo "$tool=missing"
     E22    fi
     E23  done
     E24
     E25  cat <<'NOTE'
     E26  NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2
     E27  throughput, KV movement, or accepted-task quality. Join their artifacts to the
     E28  same host, topology, driver, and time boundary as the workload receipt.
     E29  NOTE
     E30  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 30 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true

This line invokes `command` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true

This line invokes `command` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true

This line invokes `command` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then

This line selects a control path using `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding UCX statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then

This line selects a control path using `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding UCX statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"

This line invokes `echo` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 fi

This line invokes `fi` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do

This line begins the repeated control path `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` inside UCX. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v "$tool" >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` contributes to the surrounding UCX statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 echo "$tool=missing"

This line invokes `echo` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 fi

This line invokes `fi` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 done

This line invokes `done` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 cat <<'NOTE'

This line invokes `cat` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2

This line invokes `NCCL` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NCCL` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 throughput, KV movement, or accepted-task quality. Join their artifacts to the

This line invokes `throughput,` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `throughput,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 same host, topology, driver, and time boundary as the workload receipt.

This line invokes `same` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `same` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 NOTE

This line invokes `NOTE` in the UCX source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 30 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · OpenUCX Project

Source path: examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is communication_framework.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

infiniband-tools InfiniBand verbs and performance tools 30 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

InfiniBand verbs and performance tools

bash

REGISTERED SOURCE · 30 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true
     E05  command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true
     E06  command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true
     E07
     E08  if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then
     E09    "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E10    if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then
     E11      "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"
     E12    fi
     E13  else
     E14    echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"
     E15  fi
     E16
     E17  for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do
     E18    if command -v "$tool" >/dev/null; then
     E19      "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true
     E20    else
     E21      echo "$tool=missing"
     E22    fi
     E23  done
     E24
     E25  cat <<'NOTE'
     E26  NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2
     E27  throughput, KV movement, or accepted-task quality. Join their artifacts to the
     E28  same host, topology, driver, and time boundary as the workload receipt.
     E29  NOTE
     E30  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 30 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v nvidia-smi >/dev/null && nvidia-smi topo -m || true

This line invokes `command` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-smi >/dev/null && nvidia-smi nvlink --status || true

This line invokes `command` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v nvlink_bandwidth >/dev/null && nvlink_bandwidth || true

This line invokes `command` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then

This line selects a control path using `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NCCL_TESTS_DIR:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 "$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding InfiniBand verbs and performance tools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/all_reduce_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
This line requests movement or exchange; direction, source, destination, byte count, transport, timing, and HBM effect require a joined run receipt.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then

This line selects a control path using `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -x "$NCCL_TESTS_DIR/build/alltoall_perf" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 "$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"

This exact expression `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` contributes to the surrounding InfiniBand verbs and performance tools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$NCCL_TESTS_DIR/build/alltoall_perf" -b 8 -e 1G -f 2 -g "${GPU_COUNT:-2}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 echo "NCCL_TESTS_DIR not set; pin NVIDIA/nccl-tests v2.19.6 or an explicit commit"

This line invokes `echo` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 fi

This line invokes `fi` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do

This line begins the repeated control path `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` inside InfiniBand verbs and performance tools. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for tool in ibstat ibv_devinfo ib_write_bw ib_read_bw ib_send_lat ucx_info; do` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 if command -v "$tool" >/dev/null; then

This line selects a control path using `if command -v "$tool" >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v "$tool" >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 "$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true

This exact expression `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` contributes to the surrounding InfiniBand verbs and performance tools statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `"$tool" --version 2>/dev/null || "$tool" -v 2>/dev/null || "$tool" 2>/dev/null || true` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 echo "$tool=missing"

This line invokes `echo` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 fi

This line invokes `fi` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 done

This line invokes `done` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `done` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 cat <<'NOTE'

This line invokes `cat` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 NCCL Tests and verbs tools qualify the fabric. They do not prove GLM-5.2

This line invokes `NCCL` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NCCL` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 throughput, KV movement, or accepted-task quality. Join their artifacts to the

This line invokes `throughput,` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `throughput,` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 same host, topology, driver, and time boundary as the workload receipt.

This line invokes `same` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `same` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 NOTE

This line invokes `NOTE` in the InfiniBand verbs and performance tools source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 30 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · linux-rdma community with vendor contributions

Source path: examples/hbm-learning-journey/nvidia/04-distributed/qualify_fabric.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is network_qualification.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

ngc-container NGC container 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NGC container

bash

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true
     E05  command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true
     E06  command -v kubectl >/dev/null && kubectl version --client || true
     E07  command -v helm >/dev/null && helm version --short || true
     E08
     E09  if [[ -n "${NGC_IMAGE:-}" ]]; then
     E10    docker pull "$NGC_IMAGE"
     E11    docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'
     E12  else
     E13    echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"
     E14  fi
     E15
     E16  if command -v kubectl >/dev/null; then
     E17    kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true
     E18    kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true
     E19    kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true
     E20  fi
     E21
     E22  if command -v nvidia-smi >/dev/null; then
     E23    nvidia-smi -L
     E24    nvidia-smi mig -lgip 2>/dev/null || true
     E25    nvidia-smi compute-mode --query 2>/dev/null || true
     E26  fi
     E27
     E28  test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"
     E29
     E30  cat <<'NOTE'
     E31  GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment
     E32  or isolation facilities. Their presence is not evidence that the selected
     E33  inference request used them.
     E34  NOTE
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true

This line invokes `command` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true

This line invokes `command` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v kubectl >/dev/null && kubectl version --client || true

This line invokes `command` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 command -v helm >/dev/null && helm version --short || true

This line invokes `command` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if [[ -n "${NGC_IMAGE:-}" ]]; then

This line selects a control path using `if [[ -n "${NGC_IMAGE:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NGC_IMAGE:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 docker pull "$NGC_IMAGE"

This line invokes `docker` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'

This line invokes `docker` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"

This line invokes `echo` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 fi

This line invokes `fi` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 if command -v kubectl >/dev/null; then

This line selects a control path using `if command -v kubectl >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v kubectl >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true

This line invokes `kubectl` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true

This line invokes `kubectl` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true

This line binds or updates `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` for later source in NGC container. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 fi

This line invokes `fi` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 if command -v nvidia-smi >/dev/null; then

This line selects a control path using `if command -v nvidia-smi >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v nvidia-smi >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 nvidia-smi -L

This line invokes `nvidia-smi` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 nvidia-smi mig -lgip 2>/dev/null || true

This line invokes `nvidia-smi` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvidia-smi compute-mode --query 2>/dev/null || true

This line invokes `nvidia-smi` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 fi

This line invokes `fi` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"

This line invokes `test` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 cat <<'NOTE'

This line invokes `cat` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment

This line invokes `GPU` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `GPU` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 or isolation facilities. Their presence is not evidence that the selected

This line invokes `or` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `or` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 inference request used them.

This line invokes `inference` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `inference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 NOTE

This line invokes `NOTE` in the NGC container source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is environment.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvidia-container-toolkit NVIDIA Container Toolkit 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVIDIA Container Toolkit

bash

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true
     E05  command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true
     E06  command -v kubectl >/dev/null && kubectl version --client || true
     E07  command -v helm >/dev/null && helm version --short || true
     E08
     E09  if [[ -n "${NGC_IMAGE:-}" ]]; then
     E10    docker pull "$NGC_IMAGE"
     E11    docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'
     E12  else
     E13    echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"
     E14  fi
     E15
     E16  if command -v kubectl >/dev/null; then
     E17    kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true
     E18    kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true
     E19    kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true
     E20  fi
     E21
     E22  if command -v nvidia-smi >/dev/null; then
     E23    nvidia-smi -L
     E24    nvidia-smi mig -lgip 2>/dev/null || true
     E25    nvidia-smi compute-mode --query 2>/dev/null || true
     E26  fi
     E27
     E28  test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"
     E29
     E30  cat <<'NOTE'
     E31  GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment
     E32  or isolation facilities. Their presence is not evidence that the selected
     E33  inference request used them.
     E34  NOTE
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `/usr/bin/env bash` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true

This line invokes `command` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true

This line invokes `command` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v kubectl >/dev/null && kubectl version --client || true

This line invokes `command` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 command -v helm >/dev/null && helm version --short || true

This line invokes `command` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if [[ -n "${NGC_IMAGE:-}" ]]; then

This line selects a control path using `if [[ -n "${NGC_IMAGE:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if [[ -n "${NGC_IMAGE:-}" ]]; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 docker pull "$NGC_IMAGE"

This line invokes `docker` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'

This line invokes `docker` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `else` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"

This line invokes `echo` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 fi

This line invokes `fi` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 if command -v kubectl >/dev/null; then

This line selects a control path using `if command -v kubectl >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if command -v kubectl >/dev/null; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true

This line invokes `kubectl` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true

This line invokes `kubectl` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true

This line binds or updates `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` for later source in NVIDIA Container Toolkit. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 fi

This line invokes `fi` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 if command -v nvidia-smi >/dev/null; then

This line selects a control path using `if command -v nvidia-smi >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if command -v nvidia-smi >/dev/null; then` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 nvidia-smi -L

This line invokes `nvidia-smi` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 nvidia-smi mig -lgip 2>/dev/null || true

This line invokes `nvidia-smi` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvidia-smi compute-mode --query 2>/dev/null || true

This line invokes `nvidia-smi` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 fi

This line invokes `fi` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"

This line invokes `test` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 cat <<'NOTE'

This line invokes `cat` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment

This line invokes `GPU` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `GPU` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 or isolation facilities. Their presence is not evidence that the selected

This line invokes `or` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `or` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 inference request used them.

This line invokes `inference` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `inference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 NOTE

This line invokes `NOTE` in the NVIDIA Container Toolkit source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.

What it means on the GPU

A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.

How bytes could move

The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

Revision: not supplied

shared engine bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is container_runtime.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

gpu-operator NVIDIA GPU Operator 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVIDIA GPU Operator

bash

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true
     E05  command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true
     E06  command -v kubectl >/dev/null && kubectl version --client || true
     E07  command -v helm >/dev/null && helm version --short || true
     E08
     E09  if [[ -n "${NGC_IMAGE:-}" ]]; then
     E10    docker pull "$NGC_IMAGE"
     E11    docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'
     E12  else
     E13    echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"
     E14  fi
     E15
     E16  if command -v kubectl >/dev/null; then
     E17    kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true
     E18    kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true
     E19    kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true
     E20  fi
     E21
     E22  if command -v nvidia-smi >/dev/null; then
     E23    nvidia-smi -L
     E24    nvidia-smi mig -lgip 2>/dev/null || true
     E25    nvidia-smi compute-mode --query 2>/dev/null || true
     E26  fi
     E27
     E28  test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"
     E29
     E30  cat <<'NOTE'
     E31  GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment
     E32  or isolation facilities. Their presence is not evidence that the selected
     E33  inference request used them.
     E34  NOTE
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true

This line invokes `command` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true

This line invokes `command` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v kubectl >/dev/null && kubectl version --client || true

This line invokes `command` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 command -v helm >/dev/null && helm version --short || true

This line invokes `command` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if [[ -n "${NGC_IMAGE:-}" ]]; then

This line selects a control path using `if [[ -n "${NGC_IMAGE:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NGC_IMAGE:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 docker pull "$NGC_IMAGE"

This line invokes `docker` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'

This line invokes `docker` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"

This line invokes `echo` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 fi

This line invokes `fi` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 if command -v kubectl >/dev/null; then

This line selects a control path using `if command -v kubectl >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v kubectl >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true

This line invokes `kubectl` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true

This line invokes `kubectl` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true

This line binds or updates `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` for later source in NVIDIA GPU Operator. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 fi

This line invokes `fi` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 if command -v nvidia-smi >/dev/null; then

This line selects a control path using `if command -v nvidia-smi >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v nvidia-smi >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 nvidia-smi -L

This line invokes `nvidia-smi` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 nvidia-smi mig -lgip 2>/dev/null || true

This line invokes `nvidia-smi` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvidia-smi compute-mode --query 2>/dev/null || true

This line invokes `nvidia-smi` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 fi

This line invokes `fi` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"

This line invokes `test` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 cat <<'NOTE'

This line invokes `cat` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment

This line invokes `GPU` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `GPU` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 or isolation facilities. Their presence is not evidence that the selected

This line invokes `or` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `or` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 inference request used them.

This line invokes `inference` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `inference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 NOTE

This line invokes `NOTE` in the NVIDIA GPU Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is kubernetes_operator.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

network-operator NVIDIA Network Operator 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVIDIA Network Operator

bash

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true
     E05  command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true
     E06  command -v kubectl >/dev/null && kubectl version --client || true
     E07  command -v helm >/dev/null && helm version --short || true
     E08
     E09  if [[ -n "${NGC_IMAGE:-}" ]]; then
     E10    docker pull "$NGC_IMAGE"
     E11    docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'
     E12  else
     E13    echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"
     E14  fi
     E15
     E16  if command -v kubectl >/dev/null; then
     E17    kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true
     E18    kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true
     E19    kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true
     E20  fi
     E21
     E22  if command -v nvidia-smi >/dev/null; then
     E23    nvidia-smi -L
     E24    nvidia-smi mig -lgip 2>/dev/null || true
     E25    nvidia-smi compute-mode --query 2>/dev/null || true
     E26  fi
     E27
     E28  test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"
     E29
     E30  cat <<'NOTE'
     E31  GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment
     E32  or isolation facilities. Their presence is not evidence that the selected
     E33  inference request used them.
     E34  NOTE
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true

This line invokes `command` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true

This line invokes `command` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v kubectl >/dev/null && kubectl version --client || true

This line invokes `command` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 command -v helm >/dev/null && helm version --short || true

This line invokes `command` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if [[ -n "${NGC_IMAGE:-}" ]]; then

This line selects a control path using `if [[ -n "${NGC_IMAGE:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NGC_IMAGE:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 docker pull "$NGC_IMAGE"

This line invokes `docker` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'

This line invokes `docker` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"

This line invokes `echo` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 fi

This line invokes `fi` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 if command -v kubectl >/dev/null; then

This line selects a control path using `if command -v kubectl >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v kubectl >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true

This line invokes `kubectl` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true

This line invokes `kubectl` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true

This line binds or updates `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` for later source in NVIDIA Network Operator. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 fi

This line invokes `fi` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 if command -v nvidia-smi >/dev/null; then

This line selects a control path using `if command -v nvidia-smi >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v nvidia-smi >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 nvidia-smi -L

This line invokes `nvidia-smi` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 nvidia-smi mig -lgip 2>/dev/null || true

This line invokes `nvidia-smi` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvidia-smi compute-mode --query 2>/dev/null || true

This line invokes `nvidia-smi` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 fi

This line invokes `fi` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"

This line invokes `test` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 cat <<'NOTE'

This line invokes `cat` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment

This line invokes `GPU` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `GPU` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 or isolation facilities. Their presence is not evidence that the selected

This line invokes `or` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `or` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 inference request used them.

This line invokes `inference` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `inference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 NOTE

This line invokes `NOTE` in the NVIDIA Network Operator source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is kubernetes_operator.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cusparse cuSPARSE 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuSPARSE

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in cuSPARSE. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in cuSPARSE. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in cuSPARSE. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by cuSPARSE. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by cuSPARSE. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by cuSPARSE. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by cuSPARSE. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside cuSPARSE. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the cuSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is cuda_library_catalog.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cusparselt cuSPARSELt 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuSPARSELt

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in cuSPARSELt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in cuSPARSELt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in cuSPARSELt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by cuSPARSELt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by cuSPARSELt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by cuSPARSELt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by cuSPARSELt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside cuSPARSELt. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the cuSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is cuda_library_catalog.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cufft cuFFT 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuFFT

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in cuFFT. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in cuFFT. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in cuFFT. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by cuFFT. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by cuFFT. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by cuFFT. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by cuFFT. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside cuFFT. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the cuFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is cuda_library_catalog.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

curand cuRAND 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuRAND

cuda

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/cuda_primitives.cu

     E01  #include <cooperative_groups.h>
     E02  #include <cub/cub.cuh>
     E03  #include <cuda/atomic>
     E04  #include <curand_kernel.h>
     E05  #include <thrust/device_vector.h>
     E06  #include <thrust/reduce.h>
     E07
     E08  #include <cstdio>
     E09
     E10  namespace cg = cooperative_groups;
     E11
     E12  __global__ void random_and_atomic(float* values, unsigned long long seed) {
     E13      const int i = blockIdx.x * blockDim.x + threadIdx.x;
     E14      curandStatePhilox4_32_10_t state;
     E15      curand_init(seed, i, 0, &state);
     E16      values[i] = curand_uniform(&state);
     E17      cg::thread_block block = cg::this_thread_block();
     E18      block.sync();
     E19      cuda::atomic_ref<float, cuda::thread_scope_device> first(values[0]);
     E20      if (i != 0) {
     E21          first.fetch_add(values[i], cuda::memory_order_relaxed);
     E22      }
     E23  }
     E24
     E25  int main() {
     E26      constexpr int n = 256;
     E27      thrust::device_vector<float> values(n, 0.0F);
     E28      random_and_atomic<<<1, n>>>(thrust::raw_pointer_cast(values.data()), 7);
     E29      const float thrust_sum = thrust::reduce(values.begin(), values.end());
     E30      std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);
     E31      // CUB is included and compiled here; its device-wide primitives should be
     E32      // exercised in a dedicated reduction receipt rather than conflated with
     E33      // the Thrust result above.
     E34  }
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cooperative_groups.h>

This comment documents `include <cooperative_groups.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 #include <cub/cub.cuh>

This comment documents `include <cub/cub.cuh>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cuda/atomic>

This comment documents `include <cuda/atomic>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <curand_kernel.h>

This comment documents `include <curand_kernel.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 #include <thrust/device_vector.h>

This comment documents `include <thrust/device_vector.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #include <thrust/reduce.h>

This comment documents `include <thrust/reduce.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 namespace cg = cooperative_groups;

This line binds or updates `cg = cooperative_groups` for later source in cuRAND. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cg = cooperative_groups` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 __global__ void random_and_atomic(float* values, unsigned long long seed) {

This line begins the `random_and_atomic` callable contract used by cuRAND; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `random_and_atomic` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 const int i = blockIdx.x * blockDim.x + threadIdx.x;

This line binds or updates `i = blockIdx.x * blockDim.x + threadIdx.x` for later source in cuRAND. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `i = blockIdx.x * blockDim.x + threadIdx.x` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 curandStatePhilox4_32_10_t state;

This exact expression `curandStatePhilox4_32_10_t state;` contributes to the surrounding cuRAND statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `curandStatePhilox4_32_10_t state;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 curand_init(seed, i, 0, &state);

This line invokes the call chain `curand_init` when cuRAND executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `curand_init` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 values[i] = curand_uniform(&state);

This line calls `curand_uniform(...)` and binds its returned value to `values[i]` for later use in cuRAND. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `values[i] ← curand_uniform(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 cg::thread_block block = cg::this_thread_block();

This line calls `cg::this_thread_block(...)` and binds its returned value to `block` for later use in cuRAND. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `block ← cg::this_thread_block(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 block.sync();

This line invokes the call chain `block.sync` when cuRAND executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `block.sync` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 cuda::atomic_ref<float, cuda::thread_scope_device> first(values[0]);

This line begins the `first` callable contract used by cuRAND; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `first` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 if (i != 0) {

This line selects a control path using `if (i != 0) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if (i != 0) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 first.fetch_add(values[i], cuda::memory_order_relaxed);

This line invokes the call chain `first.fetch_add` when cuRAND executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `first.fetch_add` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 int main() {

This line begins the `main` callable contract used by cuRAND; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 constexpr int n = 256;

This line binds or updates `n = 256` for later source in cuRAND. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `n = 256` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 thrust::device_vector<float> values(n, 0.0F);

This line begins the `values` callable contract used by cuRAND; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `values` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 random_and_atomic<<<1, n>>>(thrust::raw_pointer_cast(values.data()), 7);

This line invokes the call chain `thrust::raw_pointer_cast → values.data` when cuRAND executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `thrust::raw_pointer_cast → values.data` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 const float thrust_sum = thrust::reduce(values.begin(), values.end());

This line calls `thrust::reduce(...)` and binds its returned value to `thrust_sum` for later use in cuRAND. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `thrust_sum ← thrust::reduce(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);

This continuation line declares or passes `std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);` as part of the surrounding call or signature in cuRAND. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 // CUB is included and compiled here; its device-wide primitives should be

This comment documents `CUB is included and compiled here; its device-wide primitives should be` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 // exercised in a dedicated reduction receipt rather than conflated with

This comment documents `exercised in a dedicated reduction receipt rather than conflated with` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 // the Thrust result above.

This comment documents `the Thrust result above.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#include <cooperative_groups.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cooperative_groups.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/cuda_primitives.cu

Revision: not supplied

shared operator cuda coverage: parser_only observation: supported evidence: illustrative
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is cuda_library_catalog.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cusolver cuSOLVER 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuSOLVER

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in cuSOLVER. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in cuSOLVER. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in cuSOLVER. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by cuSOLVER. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by cuSOLVER. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by cuSOLVER. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by cuSOLVER. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside cuSOLVER. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the cuSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is cuda_library_catalog.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cutensor cuTENSOR 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuTENSOR

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in cuTENSOR. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in cuTENSOR. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in cuTENSOR. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by cuTENSOR. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by cuTENSOR. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by cuTENSOR. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by cuTENSOR. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside cuTENSOR. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the cuTENSOR source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is cuda_library_catalog.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cutensornet cuTensorNet 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuTensorNet

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in cuTensorNet. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in cuTensorNet. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in cuTensorNet. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by cuTensorNet. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by cuTensorNet. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by cuTensorNet. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by cuTensorNet. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside cuTensorNet. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the cuTensorNet source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is cuda_library_catalog.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

thrust Thrust 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Thrust

cuda

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/cuda_primitives.cu

     E01  #include <cooperative_groups.h>
     E02  #include <cub/cub.cuh>
     E03  #include <cuda/atomic>
     E04  #include <curand_kernel.h>
     E05  #include <thrust/device_vector.h>
     E06  #include <thrust/reduce.h>
     E07
     E08  #include <cstdio>
     E09
     E10  namespace cg = cooperative_groups;
     E11
     E12  __global__ void random_and_atomic(float* values, unsigned long long seed) {
     E13      const int i = blockIdx.x * blockDim.x + threadIdx.x;
     E14      curandStatePhilox4_32_10_t state;
     E15      curand_init(seed, i, 0, &state);
     E16      values[i] = curand_uniform(&state);
     E17      cg::thread_block block = cg::this_thread_block();
     E18      block.sync();
     E19      cuda::atomic_ref<float, cuda::thread_scope_device> first(values[0]);
     E20      if (i != 0) {
     E21          first.fetch_add(values[i], cuda::memory_order_relaxed);
     E22      }
     E23  }
     E24
     E25  int main() {
     E26      constexpr int n = 256;
     E27      thrust::device_vector<float> values(n, 0.0F);
     E28      random_and_atomic<<<1, n>>>(thrust::raw_pointer_cast(values.data()), 7);
     E29      const float thrust_sum = thrust::reduce(values.begin(), values.end());
     E30      std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);
     E31      // CUB is included and compiled here; its device-wide primitives should be
     E32      // exercised in a dedicated reduction receipt rather than conflated with
     E33      // the Thrust result above.
     E34  }
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cooperative_groups.h>

This comment documents `include <cooperative_groups.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 #include <cub/cub.cuh>

This comment documents `include <cub/cub.cuh>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cuda/atomic>

This comment documents `include <cuda/atomic>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <curand_kernel.h>

This comment documents `include <curand_kernel.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 #include <thrust/device_vector.h>

This comment documents `include <thrust/device_vector.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #include <thrust/reduce.h>

This comment documents `include <thrust/reduce.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 namespace cg = cooperative_groups;

This line binds or updates `cg = cooperative_groups` for later source in Thrust. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cg = cooperative_groups` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 __global__ void random_and_atomic(float* values, unsigned long long seed) {

This line begins the `random_and_atomic` callable contract used by Thrust; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `random_and_atomic` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 const int i = blockIdx.x * blockDim.x + threadIdx.x;

This line binds or updates `i = blockIdx.x * blockDim.x + threadIdx.x` for later source in Thrust. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `i = blockIdx.x * blockDim.x + threadIdx.x` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 curandStatePhilox4_32_10_t state;

This exact expression `curandStatePhilox4_32_10_t state;` contributes to the surrounding Thrust statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `curandStatePhilox4_32_10_t state;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 curand_init(seed, i, 0, &state);

This line invokes the call chain `curand_init` when Thrust executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `curand_init` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 values[i] = curand_uniform(&state);

This line calls `curand_uniform(...)` and binds its returned value to `values[i]` for later use in Thrust. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `values[i] ← curand_uniform(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 cg::thread_block block = cg::this_thread_block();

This line calls `cg::this_thread_block(...)` and binds its returned value to `block` for later use in Thrust. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `block ← cg::this_thread_block(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 block.sync();

This line invokes the call chain `block.sync` when Thrust executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `block.sync` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 cuda::atomic_ref<float, cuda::thread_scope_device> first(values[0]);

This line begins the `first` callable contract used by Thrust; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `first` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 if (i != 0) {

This line selects a control path using `if (i != 0) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if (i != 0) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 first.fetch_add(values[i], cuda::memory_order_relaxed);

This line invokes the call chain `first.fetch_add` when Thrust executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `first.fetch_add` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 int main() {

This line begins the `main` callable contract used by Thrust; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 constexpr int n = 256;

This line binds or updates `n = 256` for later source in Thrust. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `n = 256` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 thrust::device_vector<float> values(n, 0.0F);

This line begins the `values` callable contract used by Thrust; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `values` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 random_and_atomic<<<1, n>>>(thrust::raw_pointer_cast(values.data()), 7);

This line invokes the call chain `thrust::raw_pointer_cast → values.data` when Thrust executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `thrust::raw_pointer_cast → values.data` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 const float thrust_sum = thrust::reduce(values.begin(), values.end());

This line calls `thrust::reduce(...)` and binds its returned value to `thrust_sum` for later use in Thrust. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `thrust_sum ← thrust::reduce(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);

This continuation line declares or passes `std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);` as part of the surrounding call or signature in Thrust. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 // CUB is included and compiled here; its device-wide primitives should be

This comment documents `CUB is included and compiled here; its device-wide primitives should be` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 // exercised in a dedicated reduction receipt rather than conflated with

This comment documents `exercised in a dedicated reduction receipt rather than conflated with` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 // the Thrust result above.

This comment documents `the Thrust result above.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#include <cooperative_groups.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cooperative_groups.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA / CCCL

Source path: examples/hbm-learning-journey/nvidia/07-catalog/cuda_primitives.cu

Revision: not supplied

shared operator cuda coverage: parser_only observation: supported evidence: illustrative
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is cuda_cpp_core_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cub CUB 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUB

cuda

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/cuda_primitives.cu

     E01  #include <cooperative_groups.h>
     E02  #include <cub/cub.cuh>
     E03  #include <cuda/atomic>
     E04  #include <curand_kernel.h>
     E05  #include <thrust/device_vector.h>
     E06  #include <thrust/reduce.h>
     E07
     E08  #include <cstdio>
     E09
     E10  namespace cg = cooperative_groups;
     E11
     E12  __global__ void random_and_atomic(float* values, unsigned long long seed) {
     E13      const int i = blockIdx.x * blockDim.x + threadIdx.x;
     E14      curandStatePhilox4_32_10_t state;
     E15      curand_init(seed, i, 0, &state);
     E16      values[i] = curand_uniform(&state);
     E17      cg::thread_block block = cg::this_thread_block();
     E18      block.sync();
     E19      cuda::atomic_ref<float, cuda::thread_scope_device> first(values[0]);
     E20      if (i != 0) {
     E21          first.fetch_add(values[i], cuda::memory_order_relaxed);
     E22      }
     E23  }
     E24
     E25  int main() {
     E26      constexpr int n = 256;
     E27      thrust::device_vector<float> values(n, 0.0F);
     E28      random_and_atomic<<<1, n>>>(thrust::raw_pointer_cast(values.data()), 7);
     E29      const float thrust_sum = thrust::reduce(values.begin(), values.end());
     E30      std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);
     E31      // CUB is included and compiled here; its device-wide primitives should be
     E32      // exercised in a dedicated reduction receipt rather than conflated with
     E33      // the Thrust result above.
     E34  }
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cooperative_groups.h>

This comment documents `include <cooperative_groups.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 #include <cub/cub.cuh>

This comment documents `include <cub/cub.cuh>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cuda/atomic>

This comment documents `include <cuda/atomic>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <curand_kernel.h>

This comment documents `include <curand_kernel.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 #include <thrust/device_vector.h>

This comment documents `include <thrust/device_vector.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #include <thrust/reduce.h>

This comment documents `include <thrust/reduce.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 namespace cg = cooperative_groups;

This line binds or updates `cg = cooperative_groups` for later source in CUB. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cg = cooperative_groups` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 __global__ void random_and_atomic(float* values, unsigned long long seed) {

This line begins the `random_and_atomic` callable contract used by CUB; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `random_and_atomic` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 const int i = blockIdx.x * blockDim.x + threadIdx.x;

This line binds or updates `i = blockIdx.x * blockDim.x + threadIdx.x` for later source in CUB. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `i = blockIdx.x * blockDim.x + threadIdx.x` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 curandStatePhilox4_32_10_t state;

This exact expression `curandStatePhilox4_32_10_t state;` contributes to the surrounding CUB statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `curandStatePhilox4_32_10_t state;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 curand_init(seed, i, 0, &state);

This line invokes the call chain `curand_init` when CUB executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `curand_init` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 values[i] = curand_uniform(&state);

This line calls `curand_uniform(...)` and binds its returned value to `values[i]` for later use in CUB. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `values[i] ← curand_uniform(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 cg::thread_block block = cg::this_thread_block();

This line calls `cg::this_thread_block(...)` and binds its returned value to `block` for later use in CUB. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `block ← cg::this_thread_block(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 block.sync();

This line invokes the call chain `block.sync` when CUB executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `block.sync` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 cuda::atomic_ref<float, cuda::thread_scope_device> first(values[0]);

This line begins the `first` callable contract used by CUB; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `first` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 if (i != 0) {

This line selects a control path using `if (i != 0) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if (i != 0) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 first.fetch_add(values[i], cuda::memory_order_relaxed);

This line invokes the call chain `first.fetch_add` when CUB executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `first.fetch_add` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 int main() {

This line begins the `main` callable contract used by CUB; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 constexpr int n = 256;

This line binds or updates `n = 256` for later source in CUB. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `n = 256` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 thrust::device_vector<float> values(n, 0.0F);

This line begins the `values` callable contract used by CUB; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `values` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 random_and_atomic<<<1, n>>>(thrust::raw_pointer_cast(values.data()), 7);

This line invokes the call chain `thrust::raw_pointer_cast → values.data` when CUB executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `thrust::raw_pointer_cast → values.data` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 const float thrust_sum = thrust::reduce(values.begin(), values.end());

This line calls `thrust::reduce(...)` and binds its returned value to `thrust_sum` for later use in CUB. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `thrust_sum ← thrust::reduce(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);

This continuation line declares or passes `std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);` as part of the surrounding call or signature in CUB. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 // CUB is included and compiled here; its device-wide primitives should be

This comment documents `CUB is included and compiled here; its device-wide primitives should be` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 // exercised in a dedicated reduction receipt rather than conflated with

This comment documents `exercised in a dedicated reduction receipt rather than conflated with` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 // the Thrust result above.

This comment documents `the Thrust result above.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#include <cooperative_groups.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cooperative_groups.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA / CCCL

Source path: examples/hbm-learning-journey/nvidia/07-catalog/cuda_primitives.cu

Revision: not supplied

shared operator cuda coverage: parser_only observation: supported evidence: illustrative
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is cuda_cpp_core_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

libcudacxx libcu++ 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

libcu++

cuda

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/cuda_primitives.cu

     E01  #include <cooperative_groups.h>
     E02  #include <cub/cub.cuh>
     E03  #include <cuda/atomic>
     E04  #include <curand_kernel.h>
     E05  #include <thrust/device_vector.h>
     E06  #include <thrust/reduce.h>
     E07
     E08  #include <cstdio>
     E09
     E10  namespace cg = cooperative_groups;
     E11
     E12  __global__ void random_and_atomic(float* values, unsigned long long seed) {
     E13      const int i = blockIdx.x * blockDim.x + threadIdx.x;
     E14      curandStatePhilox4_32_10_t state;
     E15      curand_init(seed, i, 0, &state);
     E16      values[i] = curand_uniform(&state);
     E17      cg::thread_block block = cg::this_thread_block();
     E18      block.sync();
     E19      cuda::atomic_ref<float, cuda::thread_scope_device> first(values[0]);
     E20      if (i != 0) {
     E21          first.fetch_add(values[i], cuda::memory_order_relaxed);
     E22      }
     E23  }
     E24
     E25  int main() {
     E26      constexpr int n = 256;
     E27      thrust::device_vector<float> values(n, 0.0F);
     E28      random_and_atomic<<<1, n>>>(thrust::raw_pointer_cast(values.data()), 7);
     E29      const float thrust_sum = thrust::reduce(values.begin(), values.end());
     E30      std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);
     E31      // CUB is included and compiled here; its device-wide primitives should be
     E32      // exercised in a dedicated reduction receipt rather than conflated with
     E33      // the Thrust result above.
     E34  }
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cooperative_groups.h>

This comment documents `include <cooperative_groups.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 #include <cub/cub.cuh>

This comment documents `include <cub/cub.cuh>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cuda/atomic>

This comment documents `include <cuda/atomic>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <curand_kernel.h>

This comment documents `include <curand_kernel.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 #include <thrust/device_vector.h>

This comment documents `include <thrust/device_vector.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #include <thrust/reduce.h>

This comment documents `include <thrust/reduce.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 namespace cg = cooperative_groups;

This line binds or updates `cg = cooperative_groups` for later source in libcu++. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cg = cooperative_groups` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 __global__ void random_and_atomic(float* values, unsigned long long seed) {

This line begins the `random_and_atomic` callable contract used by libcu++; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `random_and_atomic` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 const int i = blockIdx.x * blockDim.x + threadIdx.x;

This line binds or updates `i = blockIdx.x * blockDim.x + threadIdx.x` for later source in libcu++. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `i = blockIdx.x * blockDim.x + threadIdx.x` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 curandStatePhilox4_32_10_t state;

This exact expression `curandStatePhilox4_32_10_t state;` contributes to the surrounding libcu++ statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `curandStatePhilox4_32_10_t state;` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 curand_init(seed, i, 0, &state);

This line invokes the call chain `curand_init` when libcu++ executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `curand_init` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 values[i] = curand_uniform(&state);

This line calls `curand_uniform(...)` and binds its returned value to `values[i]` for later use in libcu++. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `values[i] ← curand_uniform(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 cg::thread_block block = cg::this_thread_block();

This line calls `cg::this_thread_block(...)` and binds its returned value to `block` for later use in libcu++. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `block ← cg::this_thread_block(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 block.sync();

This line invokes the call chain `block.sync` when libcu++ executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `block.sync` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 cuda::atomic_ref<float, cuda::thread_scope_device> first(values[0]);

This line begins the `first` callable contract used by libcu++; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `first` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 if (i != 0) {

This line selects a control path using `if (i != 0) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if (i != 0) {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 first.fetch_add(values[i], cuda::memory_order_relaxed);

This line invokes the call chain `first.fetch_add` when libcu++ executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `first.fetch_add` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 int main() {

This line begins the `main` callable contract used by libcu++; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `main` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 constexpr int n = 256;

This line binds or updates `n = 256` for later source in libcu++. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `n = 256` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 thrust::device_vector<float> values(n, 0.0F);

This line begins the `values` callable contract used by libcu++; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `values` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 random_and_atomic<<<1, n>>>(thrust::raw_pointer_cast(values.data()), 7);

This line invokes the call chain `thrust::raw_pointer_cast → values.data` when libcu++ executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `thrust::raw_pointer_cast → values.data` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 const float thrust_sum = thrust::reduce(values.begin(), values.end());

This line calls `thrust::reduce(...)` and binds its returned value to `thrust_sum` for later use in libcu++. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `thrust_sum ← thrust::reduce(...)` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);

This continuation line declares or passes `std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);` as part of the surrounding call or signature in libcu++. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 // CUB is included and compiled here; its device-wide primitives should be

This comment documents `CUB is included and compiled here; its device-wide primitives should be` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 // exercised in a dedicated reduction receipt rather than conflated with

This comment documents `exercised in a dedicated reduction receipt rather than conflated with` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 // the Thrust result above.

This comment documents `the Thrust result above.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#include <cooperative_groups.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cooperative_groups.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA / CCCL

Source path: examples/hbm-learning-journey/nvidia/07-catalog/cuda_primitives.cu

Revision: not supplied

shared operator cuda coverage: parser_only observation: supported evidence: illustrative
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is cuda_cpp_core_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cooperative-groups Cooperative Groups 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Cooperative Groups

cuda

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/cuda_primitives.cu

     E01  #include <cooperative_groups.h>
     E02  #include <cub/cub.cuh>
     E03  #include <cuda/atomic>
     E04  #include <curand_kernel.h>
     E05  #include <thrust/device_vector.h>
     E06  #include <thrust/reduce.h>
     E07
     E08  #include <cstdio>
     E09
     E10  namespace cg = cooperative_groups;
     E11
     E12  __global__ void random_and_atomic(float* values, unsigned long long seed) {
     E13      const int i = blockIdx.x * blockDim.x + threadIdx.x;
     E14      curandStatePhilox4_32_10_t state;
     E15      curand_init(seed, i, 0, &state);
     E16      values[i] = curand_uniform(&state);
     E17      cg::thread_block block = cg::this_thread_block();
     E18      block.sync();
     E19      cuda::atomic_ref<float, cuda::thread_scope_device> first(values[0]);
     E20      if (i != 0) {
     E21          first.fetch_add(values[i], cuda::memory_order_relaxed);
     E22      }
     E23  }
     E24
     E25  int main() {
     E26      constexpr int n = 256;
     E27      thrust::device_vector<float> values(n, 0.0F);
     E28      random_and_atomic<<<1, n>>>(thrust::raw_pointer_cast(values.data()), 7);
     E29      const float thrust_sum = thrust::reduce(values.begin(), values.end());
     E30      std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);
     E31      // CUB is included and compiled here; its device-wide primitives should be
     E32      // exercised in a dedicated reduction receipt rather than conflated with
     E33      // the Thrust result above.
     E34  }
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #include <cooperative_groups.h>

This comment documents `include <cooperative_groups.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 #include <cub/cub.cuh>

This comment documents `include <cub/cub.cuh>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 #include <cuda/atomic>

This comment documents `include <cuda/atomic>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 #include <curand_kernel.h>

This comment documents `include <curand_kernel.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 #include <thrust/device_vector.h>

This comment documents `include <thrust/device_vector.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 #include <thrust/reduce.h>

This comment documents `include <thrust/reduce.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 #include <cstdio>

This comment documents `include <cstdio>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 namespace cg = cooperative_groups;

This line binds or updates `cg = cooperative_groups` for later source in Cooperative Groups. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `cg = cooperative_groups` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 __global__ void random_and_atomic(float* values, unsigned long long seed) {

This line begins the `random_and_atomic` callable contract used by Cooperative Groups; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `random_and_atomic` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 const int i = blockIdx.x * blockDim.x + threadIdx.x;

This line binds or updates `i = blockIdx.x * blockDim.x + threadIdx.x` for later source in Cooperative Groups. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `i = blockIdx.x * blockDim.x + threadIdx.x` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 curandStatePhilox4_32_10_t state;

This exact expression `curandStatePhilox4_32_10_t state;` contributes to the surrounding Cooperative Groups statement. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `curandStatePhilox4_32_10_t state;` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 curand_init(seed, i, 0, &state);

This line invokes the call chain `curand_init` when Cooperative Groups executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `curand_init` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 values[i] = curand_uniform(&state);

This line calls `curand_uniform(...)` and binds its returned value to `values[i]` for later use in Cooperative Groups. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `values[i] ← curand_uniform(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 cg::thread_block block = cg::this_thread_block();

This line calls `cg::this_thread_block(...)` and binds its returned value to `block` for later use in Cooperative Groups. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `block ← cg::this_thread_block(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 block.sync();

This line invokes the call chain `block.sync` when Cooperative Groups executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `block.sync` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 cuda::atomic_ref<float, cuda::thread_scope_device> first(values[0]);

This line begins the `first` callable contract used by Cooperative Groups; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `first` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 if (i != 0) {

This line selects a control path using `if (i != 0) {` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `if (i != 0) {` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 first.fetch_add(values[i], cuda::memory_order_relaxed);

This line invokes the call chain `first.fetch_add` when Cooperative Groups executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `first.fetch_add` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 int main() {

This line begins the `main` callable contract used by Cooperative Groups; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `main` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 constexpr int n = 256;

This line binds or updates `n = 256` for later source in Cooperative Groups. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `n = 256` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 thrust::device_vector<float> values(n, 0.0F);

This line begins the `values` callable contract used by Cooperative Groups; the body runs only when called. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `values` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 random_and_atomic<<<1, n>>>(thrust::raw_pointer_cast(values.data()), 7);

This line invokes the call chain `thrust::raw_pointer_cast → values.data` when Cooperative Groups executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `thrust::raw_pointer_cast → values.data` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
This line sets or converts precision. Fewer bits can reduce capacity and bandwidth pressure and expose faster matrix paths, while scaling and conversion can add work or quality risk. Prove numerical acceptance and the actual selected device precision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 const float thrust_sum = thrust::reduce(values.begin(), values.end());

This line calls `thrust::reduce(...)` and binds its returned value to `thrust_sum` for later use in Cooperative Groups. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `thrust_sum ← thrust::reduce(...)` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);

This continuation line declares or passes `std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);` as part of the surrounding call or signature in Cooperative Groups. The excerpt line is exact, but the upstream file line number is not registered.

Source
The engine/control layer uses `std::printf("thrust_sum_with_atomic_first=%f\n", thrust_sum);` to define host-side orchestration, scheduling, caching, compilation, or launch behavior.
Runtime / compiler
When the surrounding path executes, the host runtime can use this line to prepare state or call a lower software layer.
GPU execution
A later operator or launch selects device code; this line alone identifies no SM/CU, warp/wavefront, or tensor-core work.
Memory path
The engine decision can change placement, reuse, and transfers, but source/destination, bytes, transport, and HBM traffic are unobserved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 // CUB is included and compiled here; its device-wide primitives should be

This comment documents `CUB is included and compiled here; its device-wide primitives should be` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 // exercised in a dedicated reduction receipt rather than conflated with

This comment documents `exercised in a dedicated reduction receipt rather than conflated with` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 // the Thrust result above.

This comment documents `the Thrust result above.` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#include <cooperative_groups.h>
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This comment documents `include <cooperative_groups.h>` for the reader; it executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

No runtime or compiler action is caused by this displayed line.

What it means on the GPU

No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.

How bytes could move

No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.

Why this line could matter to useful work

This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/cuda_primitives.cu

Revision: not supplied

shared engine cuda coverage: parser_only observation: supported evidence: illustrative
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This cuda excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is cuda_programming_model.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvjpeg nvJPEG 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

nvJPEG

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in nvJPEG. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in nvJPEG. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in nvJPEG. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by nvJPEG. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by nvJPEG. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by nvJPEG. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by nvJPEG. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside nvJPEG. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the nvJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is media_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvjpeg2000 nvJPEG2000 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

nvJPEG2000

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in nvJPEG2000. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in nvJPEG2000. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in nvJPEG2000. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by nvJPEG2000. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by nvJPEG2000. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by nvJPEG2000. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by nvJPEG2000. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside nvJPEG2000. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the nvJPEG2000 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is media_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvdec NVDEC 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVDEC

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in NVDEC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in NVDEC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in NVDEC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by NVDEC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by NVDEC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by NVDEC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by NVDEC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside NVDEC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the NVDEC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is media_hardware_api.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvenc NVENC 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NVENC

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in NVENC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in NVENC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in NVENC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by NVENC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by NVENC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by NVENC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by NVENC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside NVENC. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the NVENC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is media_hardware_api.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

npp NPP 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

NPP

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in NPP. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in NPP. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in NPP. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by NPP. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by NPP. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by NPP. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by NPP. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside NPP. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the NPP source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is media_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cv-cuda CV-CUDA 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CV-CUDA

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in CV-CUDA. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in CV-CUDA. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in CV-CUDA. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by CV-CUDA. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by CV-CUDA. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by CV-CUDA. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by CV-CUDA. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside CV-CUDA. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the CV-CUDA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA / CV-CUDA Project

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is media_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

dali DALI 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

DALI

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in DALI. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in DALI. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in DALI. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by DALI. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by DALI. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by DALI. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by DALI. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside DALI. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the DALI source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is data_pipeline.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

nvimagecodec nvImageCodec 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

nvImageCodec

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in nvImageCodec. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in nvImageCodec. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in nvImageCodec. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by nvImageCodec. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by nvImageCodec. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by nvImageCodec. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by nvImageCodec. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside nvImageCodec. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the nvImageCodec source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is media_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

cudss cuDSS 60 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

cuDSS

bash

REGISTERED SOURCE · 60 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  cuda_root="${CUDA_HOME:-/usr/local/cuda}"
     E05
     E06  probe_header() {
     E07    local name="$1" header="$2"
     E08    if [[ -e "$cuda_root/include/$header" ]]; then
     E09      echo "$name=header_present:$header"
     E10    else
     E11      echo "$name=missing:$header"
     E12    fi
     E13  }
     E14
     E15  probe_header cuSPARSE cusparse.h
     E16  probe_header cuSPARSELt cusparseLt.h
     E17  probe_header cuFFT cufft.h
     E18  probe_header cuRAND curand.h
     E19  probe_header cuSOLVER cusolverDn.h
     E20  probe_header cuTENSOR cutensor.h
     E21  probe_header cuTensorNet cutensornet.h
     E22  probe_header Thrust thrust/version.h
     E23  probe_header CUB cub/version.cuh
     E24  probe_header libcu++ cuda/std/version
     E25  probe_header Cooperative_Groups cooperative_groups.h
     E26  probe_header cuFile cufile.h
     E27  probe_header nvJPEG nvjpeg.h
     E28  probe_header nvJPEG2000 nvjpeg2k.h
     E29  probe_header NPP npp.h
     E30  probe_header cuDSS cudss.h
     E31
     E32  python3 - <<'PY'
     E33  import importlib.metadata as metadata
     E34
     E35  packages = {
     E36      "DALI": "nvidia-dali-cuda130",
     E37      "CV-CUDA": "cvcuda-cu13",
     E38      "nvImageCodec": "nvidia-nvimgcodec-cu13",
     E39      "nvCOMP": "nvidia-nvcomp-cu13",
     E40  }
     E41  for name, package in packages.items():
     E42      try:
     E43          print(f"{name}={metadata.version(package)}")
     E44      except metadata.PackageNotFoundError:
     E45          print(f"{name}=missing:{package}")
     E46  PY
     E47
     E48  if command -v ffmpeg >/dev/null; then
     E49    ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true
     E50    ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true
     E51  else
     E52    echo "NVDEC/NVENC=ffmpeg_missing"
     E53  fi
     E54
     E55  cat <<'NOTE'
     E56  Header/package discovery proves installation only. Every Later component stays
     E57  available_not_on_trace until a workload event and profiler artifact name its
     E58  API or kernel.
     E59  NOTE
     E60  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 60 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 cuda_root="${CUDA_HOME:-/usr/local/cuda}"

This line binds or updates `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` for later source in cuDSS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `cuda_root = "${CUDA_HOME:-/usr/local/cuda}"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 probe_header() {

This line invokes `probe_header()` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header()` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 local name="$1" header="$2"

This line binds or updates `name = "$1" header="$2"` for later source in cuDSS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `name = "$1" header="$2"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 if [[ -e "$cuda_root/include/$header" ]]; then

This line selects a control path using `if [[ -e "$cuda_root/include/$header" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -e "$cuda_root/include/$header" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 echo "$name=header_present:$header"

This line invokes `echo` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 echo "$name=missing:$header"

This line invokes `echo` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 fi

This line invokes `fi` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 probe_header cuSPARSE cusparse.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 probe_header cuSPARSELt cusparseLt.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 probe_header cuFFT cufft.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 probe_header cuRAND curand.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 probe_header cuSOLVER cusolverDn.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 probe_header cuTENSOR cutensor.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 probe_header cuTensorNet cutensornet.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 probe_header Thrust thrust/version.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 probe_header CUB cub/version.cuh

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 probe_header libcu++ cuda/std/version

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 probe_header Cooperative_Groups cooperative_groups.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 probe_header cuFile cufile.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 probe_header nvJPEG nvjpeg.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 probe_header nvJPEG2000 nvjpeg2k.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 probe_header NPP npp.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 probe_header cuDSS cudss.h

This line invokes `probe_header` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `probe_header` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 python3 - <<'PY'

This line invokes `python3` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 import importlib.metadata as metadata

This line imports `import importlib.metadata as metadata` so later source can reference it; importing does not run the workload operation. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `import importlib.metadata as metadata` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 packages = {

This line binds or updates `packages = {` for later source in cuDSS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `packages = {` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E36 "DALI": "nvidia-dali-cuda130",

This line declares `DALI = "nvidia-dali-cuda130"` as an exact configuration value used by cuDSS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `DALI = "nvidia-dali-cuda130"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E37 "CV-CUDA": "cvcuda-cu13",

This line declares `CV-CUDA = "cvcuda-cu13"` as an exact configuration value used by cuDSS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `CV-CUDA = "cvcuda-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E38 "nvImageCodec": "nvidia-nvimgcodec-cu13",

This line declares `nvImageCodec = "nvidia-nvimgcodec-cu13"` as an exact configuration value used by cuDSS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvImageCodec = "nvidia-nvimgcodec-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E39 "nvCOMP": "nvidia-nvcomp-cu13",

This line declares `nvCOMP = "nvidia-nvcomp-cu13"` as an exact configuration value used by cuDSS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `nvCOMP = "nvidia-nvcomp-cu13"` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E40 }

This line closes the surrounding expression or code block and adds no operation by itself. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E41 for name, package in packages.items():

This line begins the repeated control path `for name, package in packages.items():` inside cuDSS. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `for name, package in packages.items():` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E42 try:

This line invokes `try:` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `try:` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E43 print(f"{name}={metadata.version(package)}")

This line invokes `print(f"{name}={metadata.version(package)}")` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}={metadata.version(package)}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E44 except metadata.PackageNotFoundError:

This line invokes `except` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `except` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E45 print(f"{name}=missing:{package}")

This line invokes `print(f"{name}=missing:{package}")` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `print(f"{name}=missing:{package}")` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E46 PY

This line invokes `PY` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `PY` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E47 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E48 if command -v ffmpeg >/dev/null; then

This line selects a control path using `if command -v ffmpeg >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v ffmpeg >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E49 ffmpeg -hide_banner -decoders 2>/dev/null | grep -E 'cuvid|nvdec' | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E50 ffmpeg -hide_banner -encoders 2>/dev/null | grep nvenc | sed -n '1,10p' || true

This line invokes `ffmpeg` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `ffmpeg` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E51 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E52 echo "NVDEC/NVENC=ffmpeg_missing"

This line invokes `echo` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E53 fi

This line invokes `fi` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E54 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E55 cat <<'NOTE'

This line invokes `cat` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E56 Header/package discovery proves installation only. Every Later component stays

This line invokes `Header/package` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `Header/package` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E57 available_not_on_trace until a workload event and profiler artifact name its

This line invokes `available_not_on_trace` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `available_not_on_trace` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E58 API or kernel.

This line invokes `API` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `API` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E59 NOTE

This line invokes `NOTE` in the cuDSS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E60 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 60 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/07-catalog/library_probes.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is solver_library.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

mig Multi-Instance GPU (MIG) 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Multi-Instance GPU (MIG)

bash

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true
     E05  command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true
     E06  command -v kubectl >/dev/null && kubectl version --client || true
     E07  command -v helm >/dev/null && helm version --short || true
     E08
     E09  if [[ -n "${NGC_IMAGE:-}" ]]; then
     E10    docker pull "$NGC_IMAGE"
     E11    docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'
     E12  else
     E13    echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"
     E14  fi
     E15
     E16  if command -v kubectl >/dev/null; then
     E17    kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true
     E18    kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true
     E19    kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true
     E20  fi
     E21
     E22  if command -v nvidia-smi >/dev/null; then
     E23    nvidia-smi -L
     E24    nvidia-smi mig -lgip 2>/dev/null || true
     E25    nvidia-smi compute-mode --query 2>/dev/null || true
     E26  fi
     E27
     E28  test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"
     E29
     E30  cat <<'NOTE'
     E31  GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment
     E32  or isolation facilities. Their presence is not evidence that the selected
     E33  inference request used them.
     E34  NOTE
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true

This line invokes `command` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true

This line invokes `command` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v kubectl >/dev/null && kubectl version --client || true

This line invokes `command` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 command -v helm >/dev/null && helm version --short || true

This line invokes `command` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if [[ -n "${NGC_IMAGE:-}" ]]; then

This line selects a control path using `if [[ -n "${NGC_IMAGE:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NGC_IMAGE:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 docker pull "$NGC_IMAGE"

This line invokes `docker` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'

This line invokes `docker` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"

This line invokes `echo` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 fi

This line invokes `fi` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 if command -v kubectl >/dev/null; then

This line selects a control path using `if command -v kubectl >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v kubectl >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true

This line invokes `kubectl` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true

This line invokes `kubectl` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true

This line binds or updates `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` for later source in Multi-Instance GPU (MIG). The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 fi

This line invokes `fi` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 if command -v nvidia-smi >/dev/null; then

This line selects a control path using `if command -v nvidia-smi >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v nvidia-smi >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 nvidia-smi -L

This line invokes `nvidia-smi` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 nvidia-smi mig -lgip 2>/dev/null || true

This line invokes `nvidia-smi` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvidia-smi compute-mode --query 2>/dev/null || true

This line invokes `nvidia-smi` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 fi

This line invokes `fi` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"

This line invokes `test` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 cat <<'NOTE'

This line invokes `cat` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment

This line invokes `GPU` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `GPU` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 or isolation facilities. Their presence is not evidence that the selected

This line invokes `or` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `or` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 inference request used them.

This line invokes `inference` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `inference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 NOTE

This line invokes `NOTE` in the Multi-Instance GPU (MIG) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is gpu_partitioning.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

mps CUDA Multi-Process Service (MPS) 35 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

CUDA Multi-Process Service (MPS)

bash

REGISTERED SOURCE · 35 DISPLAYED LINES

examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

     E01  #!/usr/bin/env bash
     E02  set -euo pipefail
     E03
     E04  command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true
     E05  command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true
     E06  command -v kubectl >/dev/null && kubectl version --client || true
     E07  command -v helm >/dev/null && helm version --short || true
     E08
     E09  if [[ -n "${NGC_IMAGE:-}" ]]; then
     E10    docker pull "$NGC_IMAGE"
     E11    docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'
     E12  else
     E13    echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"
     E14  fi
     E15
     E16  if command -v kubectl >/dev/null; then
     E17    kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true
     E18    kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true
     E19    kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true
     E20  fi
     E21
     E22  if command -v nvidia-smi >/dev/null; then
     E23    nvidia-smi -L
     E24    nvidia-smi mig -lgip 2>/dev/null || true
     E25    nvidia-smi compute-mode --query 2>/dev/null || true
     E26  fi
     E27
     E28  test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"
     E29
     E30  cat <<'NOTE'
     E31  GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment
     E32  or isolation facilities. Their presence is not evidence that the selected
     E33  inference request used them.
     E34  NOTE
     E35  

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. CUDA library / runtime → NVIDIA driverCANDIDATE LAYER
  3. NVCC / NVRTC / PTXAS → cubinCANDIDATE LAYER
  4. Work queue → GPC / TPC schedulerNOT CAPTURED
  5. Blackwell SM → CUDA / Tensor CorePOSSIBLE
  6. HBM memory controllers → B200 / GB200 HBM3E teaching boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 35 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 #!/usr/bin/env bash

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `/usr/bin/env bash` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E02 set -euo pipefail

This line invokes `set` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `set` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E03 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E04 command -v docker >/dev/null && docker info --format '{{json .Runtimes}}' || true

This line invokes `command` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E05 command -v nvidia-ctk >/dev/null && nvidia-ctk --version || true

This line invokes `command` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E06 command -v kubectl >/dev/null && kubectl version --client || true

This line invokes `command` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E07 command -v helm >/dev/null && helm version --short || true

This line invokes `command` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `command` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E08 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E09 if [[ -n "${NGC_IMAGE:-}" ]]; then

This line selects a control path using `if [[ -n "${NGC_IMAGE:-}" ]]; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if [[ -n "${NGC_IMAGE:-}" ]]; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E10 docker pull "$NGC_IMAGE"

This line invokes `docker` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E11 docker image inspect "$NGC_IMAGE" --format '{{index .RepoDigests 0}}'

This line invokes `docker` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `docker` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E12 else

This line selects a control path using `else` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `else` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E13 echo "Set NGC_IMAGE to an explicitly selected tag; record the returned digest"

This line invokes `echo` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `echo` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E14 fi

This line invokes `fi` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E15 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E16 if command -v kubectl >/dev/null; then

This line selects a control path using `if command -v kubectl >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v kubectl >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E17 kubectl get clusterpolicy.nvidia.com -A 2>/dev/null || true

This line invokes `kubectl` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E18 kubectl get nicclusterpolicy.mellanox.com -A 2>/dev/null || true

This line invokes `kubectl` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `kubectl` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E19 kubectl get nodes -o jsonpath='{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n"}{end}' 2>/dev/null || true

This line binds or updates `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` for later source in CUDA Multi-Process Service (MPS). The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `jsonpath = '{range .items[*]}{.metadata.name}{"\t"}{.metadata.labels.nvidia\.com/gpu\.product}{"\n…` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E20 fi

This line invokes `fi` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E21 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E22 if command -v nvidia-smi >/dev/null; then

This line selects a control path using `if command -v nvidia-smi >/dev/null; then` when the surrounding code executes. The excerpt line is exact, but the upstream file line number is not registered.

Source
The operator layer uses `if command -v nvidia-smi >/dev/null; then` to define or invoke a tensor operation and its arguments.
Runtime / compiler
Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.
GPU execution
The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.
Memory path
Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E23 nvidia-smi -L

This line invokes `nvidia-smi` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E24 nvidia-smi mig -lgip 2>/dev/null || true

This line invokes `nvidia-smi` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E25 nvidia-smi compute-mode --query 2>/dev/null || true

This line invokes `nvidia-smi` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `nvidia-smi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E26 fi

This line invokes `fi` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `fi` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E27 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E28 test -S /tmp/nvidia-mps/control && echo "mps_control_socket=present" || echo "mps_control_socket=absent"

This line invokes `test` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `test` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E29 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E30 cat <<'NOTE'

This line invokes `cat` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `cat` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E31 GPU Operator, Network Operator, MIG, MPS, BlueField, and DOCA are deployment

This line invokes `GPU` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `GPU` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E32 or isolation facilities. Their presence is not evidence that the selected

This line invokes `or` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `or` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E33 inference request used them.

This line invokes `inference` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `inference` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E34 NOTE

This line invokes `NOTE` in the CUDA Multi-Process Service (MPS) source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `NOTE` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line
E35 blank line

This blank line separates logical parts of the excerpt and executes nothing. The excerpt line is exact, but the upstream file line number is not registered.

Source
This line changes reader structure or documentation only; it does not request a computation.
Runtime / compiler
No runtime or compiler action is caused by this displayed line.
GPU execution
No SM, CU, tensor core, warp, wavefront, copy engine, or kernel is selected.
Memory path
No allocation, transfer, cache access, HBM traffic, power, energy, water, or cost is proved.
Useful work / business implication
This line organizes, documents, imports, or closes the source. It has no standalone throughput, energy, or cost effect; its value is making the surrounding implementation understandable and buildable.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

NVIDIA Blackwell candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 35 Read this exact line
#!/usr/bin/env bash
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYCUDA library / runtime → NVIDIA driver
  3. 03 · COMPILER / BINARYNVCC / NVRTC / PTXAS → cubin
  4. 04 · GPU FRONT DOORWork queue → GPC / TPC scheduler
  5. 05 · COMPUTE BLOCKBlackwell SM → CUDA / Tensor Core
  6. 06 · ON-CHIP DATARegisters → shared memory / L1
  7. 07 · LAST-LEVEL CACHEL2 cache
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYB200 / GB200 HBM3E teaching boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This directive selects `/usr/bin/env bash` as the script interpreter. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

Framework dispatch and backend selection resolve the implementation only when this path is called with real tensors and device state.

What it means on the GPU

The line names operator semantics, not the selected kernel, launch geometry, SM/CU, warp/wavefront, or tensor-core instruction.

How bytes could move

Tensor shapes, strides, dtype, backend, and cache state determine reads, writes, temporaries, and HBM traffic; none are observed here.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: NVIDIA, framework, and code-tool catalog · NVIDIA

Source path: examples/hbm-learning-journey/nvidia/06-deployment/platform_probe.sh

Revision: not supplied

shared operator bash coverage: fixture_backed observation: supported evidence: source_backed_architecture
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to NVIDIA, framework, and code-tool catalog. Its registered role is gpu_sharing.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Registered source or capability probe only. It does not prove dispatch, HBM traffic, fabric movement, power, cooling, water, or cost.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for shared. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=fixture_backed and observation=supported.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

Run the pinned source on the declared platform and join the compiler or runtime artifact, dispatch identity, relevant counters, output, and verifier under one run ID.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocm-platform ROCm platform and compatibility matrix 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

ROCm platform and compatibility matrix

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc 'rocminfo > rocminfo.txt && hipconfig --full > hipconfig.txt && amd-smi version > amd-smi-version.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'rocminfo > rocminfo.txt && hipconfig --full > hipconfig.txt && amd-smi version > amd-smi-version.txt'

This line invokes `bash` in the ROCm platform and compatibility matrix source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'rocminfo > rocminfo.txt && hipconfig --full > hipconfig.txt && amd-smi version > amd-smi-version.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the ROCm platform and compatibility matrix source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this runtime decision changes scheduling, reuse, retries, or state placement, it can change useful latency and infrastructure demand. Measure the full accepted workflow before assigning value.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-22

comparison engine bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is platform release, driver, firmware, operating-system, and user-space compatibility. Its registered memory role is Defines the version envelope in which HBM allocations and device execution can be attributed to an AMD runtime.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'rocminfo > rocminfo.txt && hipconfig --full > hipconfig.txt && amd-smi version > amd-smi-version.txt' The three artifacts name one coherent supported release tuple and the exact detected GPU identity.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hip-runtime HIP runtime and programming model 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

HIP runtime and programming model

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/hip

     E01  bash -lc 'rocprofv3 --hip-trace --memory-copy-trace --kernel-trace --output-directory hip-trace -- ./fixed-workload'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'rocprofv3 --hip-trace --memory-copy-trace --kernel-trace --output-directory hip-trace -- ./fixed-workload'

This line invokes `bash` in the HIP runtime and programming model source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'rocprofv3 --hip-trace --memory-copy-trace --kernel-trace --output-directory hip-trace -- ./fixed-workload'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the HIP runtime and programming model source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/hip

Revision: 2026-07-21

comparison operator bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is device runtime, allocations, streams, events, launches, graphs, and peer access. Its registered memory role is Owns device allocation and copy APIs that may place or move model state and intermediate tensors in HBM.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'rocprofv3 --hip-trace --memory-copy-trace --kernel-trace --output-directory hip-trace -- ./fixed-workload' The trace joins allocations, copies, launches, workload phase markers, and accepted output under one run identity.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-pytorch-rocm PyTorch on ROCm 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

PyTorch on ROCm

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  python3 -c "import json,torch; print(json.dumps({'torch':torch.__version__,'hip':torch.version.hip,'devices':[torch.cuda.get_device_name(i) for i in range(torch.cuda.device_count())]},indent=2))"

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 python3 -c "import json,torch; print(json.dumps({'torch':torch.__version__,'hip':torch.version.hip,'devices':[torch.cuda.get_device_name(i) for i in range(torch.cuda.device_count())]},indent=2))"

This line invokes `python3` in the PyTorch on ROCm source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `python3` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
python3 -c "import json,torch; print(json.dumps({'torch':torch.__version__,'hip':torch.version.hip,'devices':[torch.cuda.get_device_name(i) for i in range(torch.cuda.device_count())]},indent=2))"
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `python3` in the PyTorch on ROCm source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line repeats work. Iteration count, exit conditions, retries, and the body’s state movement can multiply latency, energy, and cost; count completed and failed repetitions inside the accepted-task trace.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-21

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is framework tensor, ATen, autograd, distributed, and compilation entry. Its registered memory role is Creates the framework-visible tensors and caches later lowered into AMD runtime allocations and kernels.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

python3 -c "import json,torch; print(json.dumps({'torch':torch.__version__,'hip':torch.version.hip,'devices':[torch.cuda.get_device_name(i) for i in range(torch.cuda.device_count())]},indent=2))" The framework identity, dispatch, allocation, and accepted output share one run identity and exact model revision.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocr-hsa-runtime ROCr and HSA runtime 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

ROCr and HSA runtime

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocr-runtime

     E01  bash -lc 'rocprofv3 --hsa-trace --kernel-trace --memory-copy-trace --output-directory hsa-trace -- ./fixed-workload'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'rocprofv3 --hsa-trace --kernel-trace --memory-copy-trace --output-directory hsa-trace -- ./fixed-workload'

This line invokes `bash` in the ROCr and HSA runtime source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'rocprofv3 --hsa-trace --kernel-trace --memory-copy-trace --output-directory hsa-trace -- ./fixed-workload'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the ROCr and HSA runtime source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocr-runtime

Revision: 2026-07-21

comparison engine bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is queue, signal, agent, executable loading, and low-level runtime. Its registered memory role is Binds executable queues and signals to device agents and memory pools below HIP.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'rocprofv3 --hsa-trace --kernel-trace --memory-copy-trace --output-directory hsa-trace -- ./fixed-workload' The HSA trace identifies agents, queues, executable loads, copies, and dispatches for the fixed workload.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-aiter AITER inference operator library 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

AITER inference operator library

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc 'git -C "$AITER_SRC" rev-parse HEAD > aiter-revision.txt && rocprofv3 --kernel-trace --memory-copy-trace --output-directory aiter-trace -- "$WORKLOAD_RUNNER"'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'git -C "$AITER_SRC" rev-parse HEAD > aiter-revision.txt && rocprofv3 --kernel-trace --memory-copy-trace --output-directory aiter-trace -- "$WORKLOAD_RUNNER"'

This line invokes `bash` in the AITER inference operator library source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'git -C "$AITER_SRC" rev-parse HEAD > aiter-revision.txt && rocprofv3 --kernel-trace --memory-copy-trace --output-directory aiter-trace -- "$WORKLOAD_RUNNER"'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the AITER inference operator library source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 62aa6fe9a3749a1509efe320887be01058e9ae9f

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is attention, MLA, paged attention, MoE, GEMM, normalization, RoPE, quantization, sampling, and communication-aware operators. Its registered memory role is May read weights and KV pages, write activations and KV state, and allocate operator workspaces in HBM.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'git -C "$AITER_SRC" rev-parse HEAD > aiter-revision.txt && rocprofv3 --kernel-trace --memory-copy-trace --output-directory aiter-trace -- "$WORKLOAD_RUNNER"' The pinned revision, engine log, trace, and parity report identify the exact AITER operator and backend without fallback.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-composable-kernel Composable Kernel and CK Tile 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Composable Kernel and CK Tile

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/composablekernel

     E01  bash -lc 'git -C "$ROCM_LIBRARIES_SRC" rev-parse HEAD > rocm-libraries-revision.txt && "$CK_PROFILER" gemm "$CK_GEMM_ARGS" | tee ck-profile.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA matrix corePOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'git -C "$ROCM_LIBRARIES_SRC" rev-parse HEAD > rocm-libraries-revision.txt && "$CK_PROFILER" gemm "$CK_GEMM_ARGS" | tee ck-profile.txt'

This line invokes `bash` in the Composable Kernel and CK Tile source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'git -C "$ROCM_LIBRARIES_SRC" rev-parse HEAD > rocm-libraries-revision.txt && "$CK_PROFILER" gemm "$CK_GEMM_ARGS" | tee ck-profile.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA matrix core
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the Composable Kernel and CK Tile source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/composablekernel

Revision: 2026-07-21

comparison profile bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is templated HIP kernels, tile programming, examples, instances, and profiler clients. Its registered memory role is Defines tiled reads, writes, LDS staging, and HBM-facing kernel layouts for covered operators.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'git -C "$ROCM_LIBRARIES_SRC" rev-parse HEAD > rocm-libraries-revision.txt && "$CK_PROFILER" gemm "$CK_GEMM_ARGS" | tee ck-profile.txt' The profiler identifies one CK instance, exact shape, target, correctness result, and corresponding kernel trace.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hipblaslt hipBLASLt 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

hipBLASLt

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/hipblaslt

     E01  bash -lc '"$HIPBLASLT_BENCH" $HIPBLASLT_ARGS 2>&1 | tee hipblaslt-bench.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA matrix corePOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$HIPBLASLT_BENCH" $HIPBLASLT_ARGS 2>&1 | tee hipblaslt-bench.txt'

This shell command runs the registered hipBLASLt benchmark with the declared arguments, merges error output into standard output, and saves the resulting text in `hipblaslt-bench.txt`.

Source
The host shell launches the executable named by HIPBLASLT_BENCH, expands HIPBLASLT_ARGS, and preserves the combined console output through tee.
Runtime / compiler
If the executable, ROCm runtime, device, and arguments are valid, hipBLASLt can select and enqueue a tuned matrix-multiplication implementation. This command does not build the library or identify the selected kernel.
GPU execution
A successful AMD device dispatch can schedule wavefronts on CDNA compute units and use MFMA matrix instructions, but the command contains no selected HSACO, kernel name, launch geometry, CU, wavefront, or instruction receipt.
Memory path
The selected GEMM can read input matrices through the HBM controllers and cache hierarchy, stage tiles in VGPRs or LDS, and write the output matrix. Shapes, strides, dtype, cache outcomes, HBM bytes, and timing remain unknown until the benchmark output and profiler artifacts are joined.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$HIPBLASLT_BENCH" $HIPBLASLT_ARGS 2>&1 | tee hipblaslt-bench.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA matrix core
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This shell command runs the registered hipBLASLt benchmark with the declared arguments, merges error output into standard output, and saves the resulting text in `hipblaslt-bench.txt`.

What changes next in software

If the executable, ROCm runtime, device, and arguments are valid, hipBLASLt can select and enqueue a tuned matrix-multiplication implementation. This command does not build the library or identify the selected kernel.

What it means on the GPU

A successful AMD device dispatch can schedule wavefronts on CDNA compute units and use MFMA matrix instructions, but the command contains no selected HSACO, kernel name, launch geometry, CU, wavefront, or instruction receipt.

How bytes could move

The selected GEMM can read input matrices through the HBM controllers and cache hierarchy, stage tiles in VGPRs or LDS, and write the output matrix. Shapes, strides, dtype, cache outcomes, HBM bytes, and timing remain unknown until the benchmark output and profiler artifacts are joined.

Why this line could matter to useful work

This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/hipblaslt

Revision: 2026-07-21

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is descriptor-driven GEMM, heuristics, epilogues, tuning, and solution selection. Its registered memory role is Reads matrix operands and scale metadata from HBM, uses workspace, and writes GEMM outputs to HBM.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$HIPBLASLT_BENCH" $HIPBLASLT_ARGS 2>&1 | tee hipblaslt-bench.txt' The run records the selected solution, exact operands, workspace, kernel identity, and correctness on the target GPU.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocblas rocBLAS 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

rocBLAS

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocblas

     E01  bash -lc 'rocblas-bench -f gemm -r f32 --transposeA N --transposeB N -m 4096 -n 4096 -k 4096 --alpha 1 --beta 0 | tee rocblas-bench.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA matrix corePOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'rocblas-bench -f gemm -r f32 --transposeA N --transposeB N -m 4096 -n 4096 -k 4096 --alpha 1 --beta 0 | tee rocblas-bench.txt'

This line invokes `bash` in the rocBLAS source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'rocblas-bench -f gemm -r f32 --transposeA N --transposeB N -m 4096 -n 4096 -k 4096 --alpha 1 --beta 0 | tee rocblas-bench.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA matrix core
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the rocBLAS source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocblas

Revision: 2026-07-21

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is BLAS operations and reference GEMM baseline. Its registered memory role is Reads dense matrix and vector operands from HBM and writes BLAS results, with optional workspace.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'rocblas-bench -f gemm -r f32 --transposeA N --transposeB N -m 4096 -n 4096 -k 4096 --alpha 1 --beta 0 | tee rocblas-bench.txt' The benchmark, version, kernel trace, and numerical check are joined to one exact GPU identity.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-miopen MIOpen 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

MIOpen

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/miopen

     E01  bash -lc 'MIOpenDriver conv -n 1 -c 64 -H 224 -W 224 -k 64 -y 3 -x 3 -p 1 -q 1 -F 1 -V 1 | tee miopen-driver.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'MIOpenDriver conv -n 1 -c 64 -H 224 -W 224 -k 64 -y 3 -x 3 -p 1 -q 1 -F 1 -V 1 | tee miopen-driver.txt'

This line invokes `bash` in the MIOpen source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'MIOpenDriver conv -n 1 -c 64 -H 224 -W 224 -k 64 -y 3 -x 3 -p 1 -q 1 -F 1 -V 1 | tee miopen-driver.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the MIOpen source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/miopen

Revision: 2026-07-21

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is deep-learning primitives, convolutions, normalization, fusion, and solution selection. Its registered memory role is May read feature maps and weights from HBM, allocate workspace, and write convolution or normalization outputs.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'MIOpenDriver conv -n 1 -c 64 -H 224 -W 224 -k 64 -y 3 -x 3 -p 1 -q 1 -F 1 -V 1 | tee miopen-driver.txt' The exact convolution shape, solver, workspace, kernel trace, and correctness result are preserved.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-triton-backend Triton AMD backend 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Triton AMD backend

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

third_party/amd

     E01  bash -lc 'git -C "$TRITON_SRC" rev-parse HEAD > triton-revision.txt && TRITON_ALWAYS_COMPILE=1 python3 "$PINNED_TRITON_FIXTURE" 2>&1 | tee triton-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'git -C "$TRITON_SRC" rev-parse HEAD > triton-revision.txt && TRITON_ALWAYS_COMPILE=1 python3 "$PINNED_TRITON_FIXTURE" 2>&1 | tee triton-run.txt'

This line binds or updates `TRITON_ALWAYS_COMPILE = 1 python3 "$PINNED_TRITON_FIXTURE" 2>&1 | tee triton-run.txt'` for later source in Triton AMD backend. The excerpt line is exact, but the upstream file line number is not registered.

Source
The kernel source uses `TRITON_ALWAYS_COMPILE = 1 python3 "$PINNED_TRITON_FIXTURE" 2>&1 | tee triton-run.txt'` as part of a device-program definition, launch boundary, or kernel DSL expression.
Runtime / compiler
A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.
GPU execution
Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.
Memory path
Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'git -C "$TRITON_SRC" rev-parse HEAD > triton-revision.txt && TRITON_ALWAYS_COMPILE=1 python3 "$PINNED_TRITON_FIXTURE" 2>&1 | tee triton-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line binds or updates `TRITON_ALWAYS_COMPILE = 1 python3 "$PINNED_TRITON_FIXTURE" 2>&1 | tee triton-run.txt'` for later source in Triton AMD backend. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

A compiler must lower this source and a runtime must select and launch the resulting artifact before it can execute.

What it means on the GPU

Target lowering and launch geometry determine threads, warps/wavefronts, SMs/CUs, tensor/vector units, and occupancy; they are not captured here.

How bytes could move

Pointer operands and tensor layouts may cause register, shared/LDS, cache, or HBM access, but addresses, transactions, and bytes require compiled and runtime evidence.

Why this line could matter to useful work

This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: third_party/amd

Revision: 2026-07-21

comparison kernel bash coverage: parser_only observation: not_observed evidence: public_code
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is tile-language compilation, scheduling, and AMD target lowering. Its registered memory role is Generated kernels define global-memory tile loads and stores that may map to HBM traffic.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'git -C "$TRITON_SRC" rev-parse HEAD > triton-revision.txt && TRITON_ALWAYS_COMPILE=1 python3 "$PINNED_TRITON_FIXTURE" 2>&1 | tee triton-run.txt' The pinned fixture emits the exact target, autotuned configuration, generated artifact, trace, and parity result.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocwmma rocWMMA 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

rocWMMA

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocwmma

     E01  bash -lc 'git -C "$ROCM_LIBRARIES_SRC" rev-parse HEAD > rocm-libraries-revision.txt && "$ROCWMMA_SAMPLE" | tee rocwmma-sample.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA matrix corePOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'git -C "$ROCM_LIBRARIES_SRC" rev-parse HEAD > rocm-libraries-revision.txt && "$ROCWMMA_SAMPLE" | tee rocwmma-sample.txt'

This line invokes `bash` in the rocWMMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'git -C "$ROCM_LIBRARIES_SRC" rev-parse HEAD > rocm-libraries-revision.txt && "$ROCWMMA_SAMPLE" | tee rocwmma-sample.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA matrix core
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the rocWMMA source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line expresses or selects matrix multiplication. Shape, dtype, layout, tile, reuse, and the selected executable determine whether the step is compute-bound or memory-bound. Value appears only if the correct end-to-end task uses less time, energy, or hardware capacity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocwmma

Revision: 2026-07-21

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is wave-level matrix-fragment API and matrix-core programming. Its registered memory role is Loads operand fragments from HBM through cache and LDS and writes matrix results back to device memory.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'git -C "$ROCM_LIBRARIES_SRC" rev-parse HEAD > rocm-libraries-revision.txt && "$ROCWMMA_SAMPLE" | tee rocwmma-sample.txt' The sample identifies a supported target and operation, passes correctness, and preserves the device instruction and trace artifacts.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hipcc-amdclang hipcc and amdclang++ 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

hipcc and amdclang++

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc 'hipcc --version > hipcc-version.txt && hipcc --offload-arch=gfx950 -O3 -save-temps "$HIP_SOURCE" -o fixed-kernel 2> compile.log'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'hipcc --version > hipcc-version.txt && hipcc --offload-arch=gfx950 -O3 -save-temps "$HIP_SOURCE" -o fixed-kernel 2> compile.log'

This line invokes `bash` in the hipcc and amdclang++ source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'hipcc --version > hipcc-version.txt && hipcc --offload-arch=gfx950 -O3 -save-temps "$HIP_SOURCE" -o fixed-kernel 2> compile.log'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the hipcc and amdclang++ source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-21

comparison ir-ptx bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is offline HIP compilation driver and compiler frontend. Its registered memory role is Lowers source memory operations and target flags into device code that later issues cache and HBM transactions.
  1. 01 · BEFOREWhat enters

    Framework graphs, operator definitions, specialization parameters, and compiler options.

  2. 02 · THIS SOURCEWhat role it owns

    Represents the compiler boundary between high-level operations and a target-specific executable.

  3. 03 · AFTERWhat leaves

    IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

  4. 04 · VALUEWhy anyone cares

    Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the ir-ptx layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Represents the compiler boundary between high-level operations and a target-specific executable. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Framework graphs, operator definitions, specialization parameters, and compiler options. Output boundary: IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'hipcc --version > hipcc-version.txt && hipcc --offload-arch=gfx950 -O3 -save-temps "$HIP_SOURCE" -o fixed-kernel 2> compile.log' The source hash, compiler version, flags, gfx target, intermediates, and executable are captured without compile errors.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hiprtc HIPRTC 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

HIPRTC

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc '"$HIPRTC_FIXTURE" --arch gfx950 --dump-code-object hiprtc-output.hsaco 2>&1 | tee hiprtc.log'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$HIPRTC_FIXTURE" --arch gfx950 --dump-code-object hiprtc-output.hsaco 2>&1 | tee hiprtc.log'

This line invokes `bash` in the HIPRTC source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$HIPRTC_FIXTURE" --arch gfx950 --dump-code-object hiprtc-output.hsaco 2>&1 | tee hiprtc.log'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the HIPRTC source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-21

comparison ir-ptx bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is runtime HIP source compilation. Its registered memory role is Produces runtime device code whose kernels may later read and write HBM-resident objects.
  1. 01 · BEFOREWhat enters

    Framework graphs, operator definitions, specialization parameters, and compiler options.

  2. 02 · THIS SOURCEWhat role it owns

    Represents the compiler boundary between high-level operations and a target-specific executable.

  3. 03 · AFTERWhat leaves

    IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

  4. 04 · VALUEWhy anyone cares

    Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the ir-ptx layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Represents the compiler boundary between high-level operations and a target-specific executable. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Framework graphs, operator definitions, specialization parameters, and compiler options. Output boundary: IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$HIPRTC_FIXTURE" --arch gfx950 --dump-code-object hiprtc-output.hsaco 2>&1 | tee hiprtc.log' The runtime source, options, target, compile log, and emitted code object are preserved and load successfully.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-llvm-amdgpu LLVM AMDGPU backend 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

LLVM AMDGPU backend

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc 'llvm-objdump --mcpu=gfx950 --disassemble --source "$DEVICE_ARTIFACT" > amdgpu-disassembly.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'llvm-objdump --mcpu=gfx950 --disassemble --source "$DEVICE_ARTIFACT" > amdgpu-disassembly.txt'

This line invokes `bash` in the LLVM AMDGPU backend source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'llvm-objdump --mcpu=gfx950 --disassemble --source "$DEVICE_ARTIFACT" > amdgpu-disassembly.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the LLVM AMDGPU backend source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-21

comparison ir-ptx bash coverage: parser_only observation: not_observed evidence: public_code
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is LLVM target lowering, code generation, metadata, and AMDGPU ISA emission. Its registered memory role is Lowers address spaces, loads, stores, atomics, cache policy, and synchronization into target-specific device instructions.
  1. 01 · BEFOREWhat enters

    Framework graphs, operator definitions, specialization parameters, and compiler options.

  2. 02 · THIS SOURCEWhat role it owns

    Represents the compiler boundary between high-level operations and a target-specific executable.

  3. 03 · AFTERWhat leaves

    IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

  4. 04 · VALUEWhy anyone cares

    Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the ir-ptx layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Represents the compiler boundary between high-level operations and a target-specific executable. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Framework graphs, operator definitions, specialization parameters, and compiler options. Output boundary: IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'llvm-objdump --mcpu=gfx950 --disassemble --source "$DEVICE_ARTIFACT" > amdgpu-disassembly.txt' The exact device artifact disassembles for gfx950 and its load, store, synchronization, and matrix instruction regions are indexed.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-comgr-hsaco AMD COMGR, ROCm Device Libraries, and HSACO code objects 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

AMD COMGR, ROCm Device Libraries, and HSACO code objects

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/comgr

     E01  bash -lc 'readelf -h -n -s "$DEVICE_ARTIFACT" > hsaco-readelf.txt && sha256sum "$DEVICE_ARTIFACT" > hsaco-sha256.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'readelf -h -n -s "$DEVICE_ARTIFACT" > hsaco-readelf.txt && sha256sum "$DEVICE_ARTIFACT" > hsaco-sha256.txt'

This line invokes `bash` in the AMD COMGR, ROCm Device Libraries, and HSACO code objects source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'readelf -h -n -s "$DEVICE_ARTIFACT" > hsaco-readelf.txt && sha256sum "$DEVICE_ARTIFACT" > hsaco-sha256.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the AMD COMGR, ROCm Device Libraries, and HSACO code objects source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/comgr

Revision: 2026-07-21

comparison ir-ptx bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is device compilation support, linking, device libraries, metadata, and executable code-object packaging. Its registered memory role is Packages the device instructions and metadata for kernels that later operate on HBM-resident objects.
  1. 01 · BEFOREWhat enters

    Framework graphs, operator definitions, specialization parameters, and compiler options.

  2. 02 · THIS SOURCEWhat role it owns

    Represents the compiler boundary between high-level operations and a target-specific executable.

  3. 03 · AFTERWhat leaves

    IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

  4. 04 · VALUEWhy anyone cares

    Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the ir-ptx layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Represents the compiler boundary between high-level operations and a target-specific executable. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Framework graphs, operator definitions, specialization parameters, and compiler options. Output boundary: IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'readelf -h -n -s "$DEVICE_ARTIFACT" > hsaco-readelf.txt && sha256sum "$DEVICE_ARTIFACT" > hsaco-sha256.txt' The code object hash, target metadata, symbols, runtime load, and workload phase mapping agree.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rccl RCCL 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

RCCL

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rccl

     E01  bash -lc 'git -C "$RCCL_TESTS_SRC" rev-parse HEAD > rccl-tests-revision.txt && "$RCCL_TESTS_SRC/build/all_reduce_perf" -b 8 -e 8G -f 2 -g 8 | tee rccl-all-reduce.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'git -C "$RCCL_TESTS_SRC" rev-parse HEAD > rccl-tests-revision.txt && "$RCCL_TESTS_SRC/build/all_reduce_perf" -b 8 -e 8G -f 2 -g 8 | tee rccl-all-reduce.txt'

This line invokes `bash` in the RCCL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'git -C "$RCCL_TESTS_SRC" rev-parse HEAD > rccl-tests-revision.txt && "$RCCL_TESTS_SRC/build/all_reduce_perf" -b 8 -e 8G -f 2 -g 8 | tee rccl-all-reduce.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the RCCL source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line coordinates data across accelerators. Tensor size, topology, collective algorithm, link utilization, and overlap determine fabric time and energy. The business consequence is scale efficiency for the accepted workload, not advertised link bandwidth.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rccl

Revision: 2026-07-21

comparison profile bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is collective communication library for all-reduce, all-gather, reduce-scatter, all-to-all, broadcast, and point-to-point operations. Its registered memory role is Reads and writes collective buffers that may live in HBM and cross accelerator or node boundaries.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'git -C "$RCCL_TESTS_SRC" rev-parse HEAD > rccl-tests-revision.txt && "$RCCL_TESTS_SRC/build/all_reduce_perf" -b 8 -e 8G -f 2 -g 8 | tee rccl-all-reduce.txt' The pinned test, topology, algorithm log, payload sizes, errors, timing, and power telemetry share one run identity.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocshmem rocSHMEM 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

rocSHMEM

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocshmem

     E01  bash -lc 'git -C "$ROCSHMEM_SRC" rev-parse HEAD > rocshmem-revision.txt && "$ROCSHMEM_FIXTURE" 2>&1 | tee rocshmem-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'git -C "$ROCSHMEM_SRC" rev-parse HEAD > rocshmem-revision.txt && "$ROCSHMEM_FIXTURE" 2>&1 | tee rocshmem-run.txt'

This line invokes `bash` in the rocSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'git -C "$ROCSHMEM_SRC" rev-parse HEAD > rocshmem-revision.txt && "$ROCSHMEM_FIXTURE" 2>&1 | tee rocshmem-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the rocSHMEM source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocshmem

Revision: 2026-07-21

comparison profile bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is partitioned global address-space communication and device-initiated memory operations. Its registered memory role is May expose symmetric device buffers and remote operations involving HBM-resident data.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'git -C "$ROCSHMEM_SRC" rev-parse HEAD > rocshmem-revision.txt && "$ROCSHMEM_FIXTURE" 2>&1 | tee rocshmem-run.txt' The run proves the exact heap placement, operation, physical transport, payload, and correctness on the named platform.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-mori MoRI, MoRI-IO, and MoRI expert-parallel communication 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

MoRI, MoRI-IO, and MoRI expert-parallel communication

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc 'git -C "$MORI_SRC" rev-parse HEAD > mori-revision.txt && "$PINNED_MORI_RUNNER" 2>&1 | tee mori-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'git -C "$MORI_SRC" rev-parse HEAD > mori-revision.txt && "$PINNED_MORI_RUNNER" 2>&1 | tee mori-run.txt'

This line invokes `bash` in the MoRI, MoRI-IO, and MoRI expert-parallel communication source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'git -C "$MORI_SRC" rev-parse HEAD > mori-revision.txt && "$PINNED_MORI_RUNNER" 2>&1 | tee mori-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the MoRI, MoRI-IO, and MoRI expert-parallel communication source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-21

comparison operator bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is modular RDMA interface, prefill/decode state transfer, and expert dispatch/combine. Its registered memory role is May move KV blocks and expert-routing buffers between GPU HBM and RDMA-visible communication paths.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'git -C "$MORI_SRC" rev-parse HEAD > mori-revision.txt && "$PINNED_MORI_RUNNER" 2>&1 | tee mori-run.txt' The run joins the selected MoRI component, exact buffer identity, physical path, transfer timing, and accepted output.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-fabric-boundary Infinity Fabric, UALink or UALoE, and Ultra Ethernet boundary 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Infinity Fabric, UALink or UALoE, and Ultra Ethernet boundary

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc 'amd-smi topology --show-weight > topology-weight.txt && amd-smi topology --show-hops > topology-hops.txt && amd-smi topology --show-link-type > topology-links.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'amd-smi topology --show-weight > topology-weight.txt && amd-smi topology --show-hops > topology-hops.txt && amd-smi topology --show-link-type > topology-links.txt'

This line invokes `bash` in the Infinity Fabric, UALink or UALoE, and Ultra Ethernet boundary source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'amd-smi topology --show-weight > topology-weight.txt && amd-smi topology --show-hops > topology-hops.txt && amd-smi topology --show-link-type > topology-links.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the Infinity Fabric, UALink or UALoE, and Ultra Ethernet boundary source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this operation selects a better implementation or data layout, it can change the time and bytes required for a repeated model step. The operator name alone does not establish savings.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-22

comparison operator bash coverage: parser_only observation: not_observed evidence: official_preliminary
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is physical scale-up and scale-out topology beneath communication software. Its registered memory role is Carries communication derived from HBM-resident tensors across accelerator, tray, rack, or cluster boundaries.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'amd-smi topology --show-weight > topology-weight.txt && amd-smi topology --show-hops > topology-hops.txt && amd-smi topology --show-link-type > topology-links.txt' The detected topology and physical link inventory are joined to the exact collective or transfer trace.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocprofiler-sdk ROCprofiler-SDK and rocprofv3 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

ROCprofiler-SDK and rocprofv3

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocprofiler-sdk

     E01  bash -lc 'rocprofv3-avail > rocprofv3-available.txt && rocprofv3 --runtime-trace --kernel-trace --memory-copy-trace --marker-trace --output-format csv --output-directory rocprofv3-out -- "$WORKLOAD_RUNNER"'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'rocprofv3-avail > rocprofv3-available.txt && rocprofv3 --runtime-trace --kernel-trace --memory-copy-trace --marker-trace --output-format csv --output-directory rocprofv3-out -- "$WORKLOAD_RUNNER"'

This line invokes `bash` in the ROCprofiler-SDK and rocprofv3 source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'rocprofv3-avail > rocprofv3-available.txt && rocprofv3 --runtime-trace --kernel-trace --memory-copy-trace --marker-trace --output-format csv --output-directory rocprofv3-out -- "$WORKLOAD_RUNNER"'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the ROCprofiler-SDK and rocprofv3 source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocprofiler-sdk

Revision: 2026-07-21

comparison profile bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is HIP, HSA, kernel, memory-copy, allocation, marker, counter, and communication tracing. Its registered memory role is Can observe allocation, copy, dispatch, and counter surfaces needed to attribute candidate HBM activity.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'rocprofv3-avail > rocprofv3-available.txt && rocprofv3 --runtime-trace --kernel-trace --memory-copy-trace --marker-trace --output-format csv --output-directory rocprofv3-out -- "$WORKLOAD_RUNNER"' The trace includes phase markers, runtime calls, kernels, copies, and a stable schema under the same run identity.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocm-compute-profiler ROCm Compute Profiler 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

ROCm Compute Profiler

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocprofiler-compute

     E01  bash -lc 'rocprof-compute profile -n "$RUN_NAME" --format-rocprof-output csv -- "$WORKLOAD_RUNNER" && rocprof-compute analyze -p "./workloads/$RUN_NAME/$GPU_TARGET"'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'rocprof-compute profile -n "$RUN_NAME" --format-rocprof-output csv -- "$WORKLOAD_RUNNER" && rocprof-compute analyze -p "./workloads/$RUN_NAME/$GPU_TARGET"'

This line invokes `bash` in the ROCm Compute Profiler source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'rocprof-compute profile -n "$RUN_NAME" --format-rocprof-output csv -- "$WORKLOAD_RUNNER" && rocprof-compute analyze -p "./workloads/$RUN_NAME/$GPU_TARGET"'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the ROCm Compute Profiler source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocprofiler-compute

Revision: 2026-07-21

comparison profile bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is kernel counters, roofline, memory analysis, occupancy, and baseline comparison. Its registered memory role is Can expose counters related to cache, HBM bandwidth, LDS, occupancy, and instruction mix for a selected kernel.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'rocprof-compute profile -n "$RUN_NAME" --format-rocprof-output csv -- "$WORKLOAD_RUNNER" && rocprof-compute analyze -p "./workloads/$RUN_NAME/$GPU_TARGET"' The selected kernel, counter availability, raw counters, analysis, timing, and correctness are preserved together.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocm-systems-profiler ROCm Systems Profiler 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

ROCm Systems Profiler

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocprofiler-systems

     E01  bash -lc 'rocprof-sys-sample --output-path rocprof-sys-out -- "$WORKLOAD_RUNNER"'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'rocprof-sys-sample --output-path rocprof-sys-out -- "$WORKLOAD_RUNNER"'

This line invokes `bash` in the ROCm Systems Profiler source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'rocprof-sys-sample --output-path rocprof-sys-out -- "$WORKLOAD_RUNNER"'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the ROCm Systems Profiler source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line exposes or stores a result for the next layer. Its value depends on whether the output satisfies the acceptance rule and whether producing and retaining it can be traced to the same runtime and resource interval.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocprofiler-systems

Revision: 2026-07-21

comparison profile bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is CPU, thread, runtime, system, accelerator, and communication timeline. Its registered memory role is Can place HBM-facing kernels and copies in the same timeline as CPU scheduling, tools, storage, and network work.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'rocprof-sys-sample --output-path rocprof-sys-out -- "$WORKLOAD_RUNNER"' The system timeline aligns CPU, runtime, kernel, copy, communication, tool, and accepted-output events.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-smi-telemetry AMD SMI telemetry 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

AMD SMI telemetry

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc 'amd-smi version > amd-smi-version.txt && amd-smi metric --csv > amd-smi-metric.csv'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'amd-smi version > amd-smi-version.txt && amd-smi metric --csv > amd-smi-metric.csv'

This line invokes `bash` in the AMD SMI telemetry source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'amd-smi version > amd-smi-version.txt && amd-smi metric --csv > amd-smi-metric.csv'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the AMD SMI telemetry source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-21

comparison profile bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is device inventory, clocks, power, temperature, memory use, topology, links, and health telemetry. Its registered memory role is Can report device-level memory allocation and health signals, but not which workload object produced the bytes.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'amd-smi version > amd-smi-version.txt && amd-smi metric --csv > amd-smi-metric.csv' The raw telemetry schema, cadence, GPU identity, and workload timestamps are preserved without inferring per-object traffic.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-smi-management AMD SMI management and RAS controls 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

AMD SMI management and RAS controls

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc 'amd-smi static --asic --board --vbios --driver > amd-smi-static.txt && amd-smi metric --ecc --pcie --xgmi > amd-smi-ras.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'amd-smi static --asic --board --vbios --driver > amd-smi-static.txt && amd-smi metric --ecc --pcie --xgmi > amd-smi-ras.txt'

This line invokes `bash` in the AMD SMI management and RAS controls source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'amd-smi static --asic --board --vbios --driver > amd-smi-static.txt && amd-smi metric --ecc --pcie --xgmi > amd-smi-ras.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the AMD SMI management and RAS controls source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-21

comparison power-cost bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is inventory, configuration, reset, process, firmware, error, topology, and reliability administration. Its registered memory role is Exposes device and memory health boundaries needed before treating an HBM result as valid.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'amd-smi static --asic --board --vbios --driver > amd-smi-static.txt && amd-smi metric --ecc --pcie --xgmi > amd-smi-ras.txt' Preflight and postflight inventory and RAS records show the same hardware identity and no unaccounted memory or link fault.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rvs ROCm Validation Suite 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

ROCm Validation Suite

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc 'rvs -g > rvs-gpu-list.txt && rvs -c "$RVS_CONFIG" -l rvs-run.log'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'rvs -g > rvs-gpu-list.txt && rvs -c "$RVS_CONFIG" -l rvs-run.log'

This line invokes `bash` in the ROCm Validation Suite source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'rvs -g > rvs-gpu-list.txt && rvs -c "$RVS_CONFIG" -l rvs-run.log'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the ROCm Validation Suite source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-21

comparison power-cost bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is system qualification, stress, memory, PCIe, peer, and GPU validation. Its registered memory role is Can exercise memory and platform health before workload-specific HBM claims are accepted.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'rvs -g > rvs-gpu-list.txt && rvs -c "$RVS_CONFIG" -l rvs-run.log' The pinned suite and configuration complete on the named hardware with explicit pass, fail, and error records.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-instinct-system-acceptance AMD Instinct MI355X system acceptance guide 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

AMD Instinct MI355X system acceptance guide

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc 'sudo lspci -d 1002:75a3 > mi355x-pcie.txt && test "$(wc -l < mi355x-pcie.txt)" -eq 8'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'sudo lspci -d 1002:75a3 > mi355x-pcie.txt && test "$(wc -l < mi355x-pcie.txt)" -eq 8'

This line invokes `bash` in the AMD Instinct MI355X system acceptance guide source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'sudo lspci -d 1002:75a3 > mi355x-pcie.txt && test "$(wc -l < mi355x-pcie.txt)" -eq 8'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the AMD Instinct MI355X system acceptance guide source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-22

comparison power-cost bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is platform bring-up and acceptance tests for inventory, memory, fabric, power, cooling, and sustained operation. Its registered memory role is Defines the acceptance boundary that must pass before a workload-specific HBM receipt is trusted.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'sudo lspci -d 1002:75a3 > mi355x-pcie.txt && test "$(wc -l < mi355x-pcie.txt)" -eq 8' The exact eight-device platform and every required acceptance test pass with dated operator signoff.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocdecode rocDecode 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

rocDecode

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocdecode

     E01  bash -lc 'git -C "$ROCDECODE_SRC" rev-parse HEAD > rocdecode-revision.txt && "$ROCDECODE_SAMPLE" "$PINNED_VIDEO" 2>&1 | tee rocdecode-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'git -C "$ROCDECODE_SRC" rev-parse HEAD > rocdecode-revision.txt && "$ROCDECODE_SAMPLE" "$PINNED_VIDEO" 2>&1 | tee rocdecode-run.txt'

This line invokes `bash` in the rocDecode source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'git -C "$ROCDECODE_SRC" rev-parse HEAD > rocdecode-revision.txt && "$ROCDECODE_SAMPLE" "$PINNED_VIDEO" 2>&1 | tee rocdecode-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the rocDecode source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocdecode

Revision: 2026-07-21

comparison operator bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is video decode API and hardware-assisted media ingest. Its registered memory role is May create decoded frame surfaces and staging buffers before preprocessing or model input.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'git -C "$ROCDECODE_SRC" rev-parse HEAD > rocdecode-revision.txt && "$ROCDECODE_SAMPLE" "$PINNED_VIDEO" 2>&1 | tee rocdecode-run.txt' The exact codec, platform support, decoded surfaces, checksums, and memory-copy path are captured.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocjpeg rocJPEG 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

rocJPEG

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocjpeg

     E01  bash -lc 'git -C "$ROCJPEG_SRC" rev-parse HEAD > rocjpeg-revision.txt && "$ROCJPEG_SAMPLE" "$PINNED_IMAGE" 2>&1 | tee rocjpeg-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'git -C "$ROCJPEG_SRC" rev-parse HEAD > rocjpeg-revision.txt && "$ROCJPEG_SAMPLE" "$PINNED_IMAGE" 2>&1 | tee rocjpeg-run.txt'

This line invokes `bash` in the rocJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'git -C "$ROCJPEG_SRC" rev-parse HEAD > rocjpeg-revision.txt && "$ROCJPEG_SAMPLE" "$PINNED_IMAGE" 2>&1 | tee rocjpeg-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the rocJPEG source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocjpeg

Revision: 2026-07-21

comparison operator bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is JPEG decode and image ingest. Its registered memory role is May create decoded image surfaces and staging buffers before multimodal or video preprocessing.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'git -C "$ROCJPEG_SRC" rev-parse HEAD > rocjpeg-revision.txt && "$ROCJPEG_SAMPLE" "$PINNED_IMAGE" 2>&1 | tee rocjpeg-run.txt' The exact image, backend, output checksum, device placement, and copy trace are preserved.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocal rocAL 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

rocAL

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc '"$ROCAL_FIXTURE" --input "$PINNED_MEDIA_MANIFEST" --output rocal-output 2>&1 | tee rocal-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$ROCAL_FIXTURE" --input "$PINNED_MEDIA_MANIFEST" --output rocal-output 2>&1 | tee rocal-run.txt'

This line invokes `bash` in the rocAL source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$ROCAL_FIXTURE" --input "$PINNED_MEDIA_MANIFEST" --output rocal-output 2>&1 | tee rocal-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the rocAL source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-21

comparison operator bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is accelerated data loading, decode, augmentation, and preprocessing pipeline. Its registered memory role is May allocate input batches, decoded surfaces, augmentation intermediates, and model-ready tensors.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$ROCAL_FIXTURE" --input "$PINNED_MEDIA_MANIFEST" --output rocal-output 2>&1 | tee rocal-run.txt' The pinned pipeline, operators, placement, tensors, checksums, and runtime trace are preserved.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rpp ROCm Performance Primitives 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

ROCm Performance Primitives

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

Source path not registered

     E01  bash -lc '"$RPP_FIXTURE" --manifest "$PINNED_IMAGE_BATCH" 2>&1 | tee rpp-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$RPP_FIXTURE" --manifest "$PINNED_IMAGE_BATCH" 2>&1 | tee rpp-run.txt'

This line invokes `bash` in the ROCm Performance Primitives source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$RPP_FIXTURE" --manifest "$PINNED_IMAGE_BATCH" 2>&1 | tee rpp-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the ROCm Performance Primitives source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line changes or describes state placement and reuse. It can avoid a slower transfer or consume scarce fast memory; the decision is valuable only when hit rate, residency, bytes avoided, latency, and accepted output are measured together.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: not supplied

Revision: 2026-07-21

comparison operator bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is image and tensor preprocessing primitives. Its registered memory role is May read decoded image or tensor batches, apply preprocessing, and write model-ready outputs.
  1. 01 · BEFOREWhat enters

    Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime.

  2. 02 · THIS SOURCEWhat role it owns

    Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel.

  3. 03 · AFTERWhat leaves

    An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

  4. 04 · VALUEWhy anyone cares

    Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the operator layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Operator choice can expose or hide better kernels and memory access patterns. The relevant result is useful latency, quality, and accepted throughput, not the operator name.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Expresses one mathematical or data-movement operation between the framework and an implementation library or kernel. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Named tensors, shapes, dtypes, parameters, and an operation contract from the model or runtime. Output boundary: An output tensor or state transition whose implementation still must be selected, compiled, launched, and verified.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$RPP_FIXTURE" --manifest "$PINNED_IMAGE_BATCH" 2>&1 | tee rpp-run.txt' The exact primitive, layout, backend, checksums, and runtime trace are joined under one run identity.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-therock-gfx1250-bringup ROCm 7.14 TheRock gfx1250 source-bring-up registry 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

ROCm 7.14 TheRock gfx1250 source-bring-up registry

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

cmake/therock_amdgpu_targets.cmake

     E01  bash -lc 'git -C "$THEROCK_SRC" checkout therock-7.14 && git -C "$THEROCK_SRC" rev-parse HEAD > therock-revision.txt && rg -n "gfx1250.*MI450/MI450X/MI455X" "$THEROCK_SRC/cmake/therock_amdgpu_targets.cmake" > therock-gfx1250.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'git -C "$THEROCK_SRC" checkout therock-7.14 && git -C "$THEROCK_SRC" rev-parse HEAD > therock-revision.txt && rg -n "gfx1250.*MI450/MI450X/MI455X" "$THEROCK_SRC/cmake/therock_amdgpu_targets.cmake" > therock-gfx1250.txt'

This line invokes `bash` in the ROCm 7.14 TheRock gfx1250 source-bring-up registry source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'git -C "$THEROCK_SRC" checkout therock-7.14 && git -C "$THEROCK_SRC" rev-parse HEAD > therock-revision.txt && rg -n "gfx1250.*MI450/MI450X/MI455X" "$THEROCK_SRC/cmake/therock_amdgpu_targets.cmake" > therock-gfx1250.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the ROCm 7.14 TheRock gfx1250 source-bring-up registry source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: cmake/therock_amdgpu_targets.cmake

Revision: f8d499f4b6980ea3dae32c1f87f9113aa390f8f0

comparison ir-ptx bash coverage: parser_only observation: not_observed evidence: public_code
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is ROCm build and distribution target registry at tag therock-7.14. Its registered memory role is A source target can make future HBM4-capable device code buildable, but it does not allocate HBM or establish a supported runtime.
  1. 01 · BEFOREWhat enters

    Framework graphs, operator definitions, specialization parameters, and compiler options.

  2. 02 · THIS SOURCEWhat role it owns

    Represents the compiler boundary between high-level operations and a target-specific executable.

  3. 03 · AFTERWhat leaves

    IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

  4. 04 · VALUEWhy anyone cares

    Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the ir-ptx layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Represents the compiler boundary between high-level operations and a target-specific executable. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Framework graphs, operator definitions, specialization parameters, and compiler options. Output boundary: IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'git -C "$THEROCK_SRC" checkout therock-7.14 && git -C "$THEROCK_SRC" rev-parse HEAD > therock-revision.txt && rg -n "gfx1250.*MI450/MI450X/MI455X" "$THEROCK_SRC/cmake/therock_amdgpu_targets.cmake" > therock-gfx1250.txt' The source receipt reproduces the tagged gfx1250 registry entry while the separate supported-hardware table still identifies the qualified product boundary.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-amdgpu-kfd-firmware amdgpu, KFD, and GPU firmware boundary 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

amdgpu, KFD, and GPU firmware boundary

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

drivers/gpu/drm/amd/amdgpu and drivers/gpu/drm/amd/amdkfd

     E01  bash -lc 'uname -a > kernel.txt && modinfo amdgpu > amdgpu-modinfo.txt && dmesg --level=err,warn | rg -i "amdgpu|kfd|firmware" > amdgpu-kfd-dmesg.txt || true'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'uname -a > kernel.txt && modinfo amdgpu > amdgpu-modinfo.txt && dmesg --level=err,warn | rg -i "amdgpu|kfd|firmware" > amdgpu-kfd-dmesg.txt || true'

This line invokes `bash` in the amdgpu, KFD, and GPU firmware boundary source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'uname -a > kernel.txt && modinfo amdgpu > amdgpu-modinfo.txt && dmesg --level=err,warn | rg -i "amdgpu|kfd|firmware" > amdgpu-kfd-dmesg.txt || true'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the amdgpu, KFD, and GPU firmware boundary source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this compiler representation changes generated code or portability, it can change performance and engineering burden. Inspect the final executable and measured run before making a platform decision.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: drivers/gpu/drm/amd/amdgpu and drivers/gpu/drm/amd/amdkfd

Revision: 2026-07-23

comparison ir-ptx bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is kernel driver, compute-device interface, firmware loading, memory mapping, queues, and reset boundary. Its registered memory role is Owns the kernel-visible GPU memory, process, queue, page-mapping, fault, reset, and firmware boundary beneath ROCr and HIP.
  1. 01 · BEFOREWhat enters

    Framework graphs, operator definitions, specialization parameters, and compiler options.

  2. 02 · THIS SOURCEWhat role it owns

    Represents the compiler boundary between high-level operations and a target-specific executable.

  3. 03 · AFTERWhat leaves

    IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

  4. 04 · VALUEWhy anyone cares

    Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the ir-ptx layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Compiler portability and specialization affect engineering time, hardware choice, and performance risk. Intermediate code alone is not a savings receipt.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Represents the compiler boundary between high-level operations and a target-specific executable. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Framework graphs, operator definitions, specialization parameters, and compiler options. Output boundary: IR, PTX, LLVM, AMDGPU, or another intermediate artifact that still requires target assembly and launch proof.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'uname -a > kernel.txt && modinfo amdgpu > amdgpu-modinfo.txt && dmesg --level=err,warn | rg -i "amdgpu|kfd|firmware" > amdgpu-kfd-dmesg.txt || true' The exact kernel, driver, firmware, KFD topology, and named hardware are joined before any runtime or HBM claim.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocminfo rocminfo HSA agent and memory-pool inventory 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

rocminfo HSA agent and memory-pool inventory

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocminfo

     E01  bash -lc 'rocminfo > rocminfo.txt && sha256sum rocminfo.txt > rocminfo.sha256'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'rocminfo > rocminfo.txt && sha256sum rocminfo.txt > rocminfo.sha256'

This line invokes `bash` in the rocminfo HSA agent and memory-pool inventory source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'rocminfo > rocminfo.txt && sha256sum rocminfo.txt > rocminfo.sha256'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the rocminfo HSA agent and memory-pool inventory source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocminfo

Revision: 2026-07-23

comparison profile bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is HSA system, agent, cache, ISA, queue, and memory-pool enumeration. Its registered memory role is Reports the runtime-visible agents and memory pools required to distinguish a detected accelerator from an assumed one.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'rocminfo > rocminfo.txt && sha256sum rocminfo.txt > rocminfo.sha256' The captured inventory names the exact agent, ISA, queues, caches, and memory pools and is joined to the driver and firmware tuple.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hipblas hipBLAS portability wrapper 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

hipBLAS portability wrapper

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/hipblas

     E01  bash -lc '"$HIPBLAS_BENCH" $HIPBLAS_ARGS 2>&1 | tee hipblas-bench.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA matrix corePOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$HIPBLAS_BENCH" $HIPBLAS_ARGS 2>&1 | tee hipblas-bench.txt'

This line invokes `bash` in the hipBLAS portability wrapper source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$HIPBLAS_BENCH" $HIPBLAS_ARGS 2>&1 | tee hipblas-bench.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA matrix core
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the hipBLAS portability wrapper source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/hipblas

Revision: 2026-07-23

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is BLAS portability interface and backend dispatch wrapper. Its registered memory role is Accepts matrix and vector operands, strides, layouts, and workspaces that may reside in HBM before dispatching to a backend.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$HIPBLAS_BENCH" $HIPBLAS_ARGS 2>&1 | tee hipblas-bench.txt' The receipt joins the wrapper call, selected backend, operands, workspace, dispatch, and correctness on the named GPU.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hiptensor hipTensor 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

hipTensor

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/hiptensor

     E01  bash -lc '"$HIPTENSOR_FIXTURE" --manifest "$HIPTENSOR_CASE" 2>&1 | tee hiptensor-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA matrix corePOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$HIPTENSOR_FIXTURE" --manifest "$HIPTENSOR_CASE" 2>&1 | tee hiptensor-run.txt'

This line invokes `bash` in the hipTensor source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$HIPTENSOR_FIXTURE" --manifest "$HIPTENSOR_CASE" 2>&1 | tee hiptensor-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA matrix core
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the hipTensor source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/hiptensor

Revision: 2026-07-23

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is tensor contraction, permutation, reduction, and plan selection. Its registered memory role is Reads multidimensional tensors and metadata, may allocate workspace, and writes contracted or transformed tensors.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$HIPTENSOR_FIXTURE" --manifest "$HIPTENSOR_CASE" 2>&1 | tee hiptensor-run.txt' The exact contraction or transform, plan, workspace, device artifact, and numerical result are joined.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hipsparse-rocsparse hipSPARSE and rocSPARSE 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

hipSPARSE and rocSPARSE

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/hipsparse and projects/rocsparse

     E01  bash -lc '"$ROCSPARSE_FIXTURE" --manifest "$SPARSE_CASE" 2>&1 | tee rocsparse-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$ROCSPARSE_FIXTURE" --manifest "$SPARSE_CASE" 2>&1 | tee rocsparse-run.txt'

This line invokes `bash` in the hipSPARSE and rocSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$ROCSPARSE_FIXTURE" --manifest "$SPARSE_CASE" 2>&1 | tee rocsparse-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the hipSPARSE and rocSPARSE source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/hipsparse and projects/rocsparse

Revision: 2026-07-23

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is sparse matrix and vector portability interface plus AMD backend. Its registered memory role is Reads sparse values, indices, pointers, dense operands, and workspaces and writes sparse or dense outputs.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$ROCSPARSE_FIXTURE" --manifest "$SPARSE_CASE" 2>&1 | tee rocsparse-run.txt' The receipt preserves the sparse format, indices, operands, workspace, selected backend, dispatch, and correctness.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hipsparselt hipSPARSELt 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

hipSPARSELt

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/hipsparselt

     E01  bash -lc '"$HIPSPARSELT_BENCH" $HIPSPARSELT_ARGS 2>&1 | tee hipsparselt-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$HIPSPARSELT_BENCH" $HIPSPARSELT_ARGS 2>&1 | tee hipsparselt-run.txt'

This line invokes `bash` in the hipSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$HIPSPARSELT_BENCH" $HIPSPARSELT_ARGS 2>&1 | tee hipsparselt-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the hipSPARSELt source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/hipsparselt

Revision: 2026-07-23

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is structured-sparse matrix multiplication, pruning, compression, plan, and algorithm selection. Its registered memory role is May store structured-sparse weights, compressed metadata, dense activations, workspace, and outputs in HBM.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$HIPSPARSELT_BENCH" $HIPSPARSELT_ARGS 2>&1 | tee hipsparselt-run.txt' The selected target, sparse contract, compression, algorithm, dispatch, and correctness are preserved.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hipfft-rocfft hipFFT and rocFFT 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

hipFFT and rocFFT

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/hipfft and projects/rocfft

     E01  bash -lc '"$ROCFFT_RIDER" $ROCFFT_ARGS 2>&1 | tee rocfft-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$ROCFFT_RIDER" $ROCFFT_ARGS 2>&1 | tee rocfft-run.txt'

This line invokes `bash` in the hipFFT and rocFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$ROCFFT_RIDER" $ROCFFT_ARGS 2>&1 | tee rocfft-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the hipFFT and rocFFT source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/hipfft and projects/rocfft

Revision: 2026-07-23

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is FFT portability interface, plan generation, kernels, work buffers, and transforms. Its registered memory role is Reads signal tensors, twiddle or plan data, and workspace and writes frequency-domain or inverse-transform outputs.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$ROCFFT_RIDER" $ROCFFT_ARGS 2>&1 | tee rocfft-run.txt' The exact transform, plan, workspace, dispatch, and correctness are joined to a named workload step.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hiprand-rocrand hipRAND and rocRAND 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

hipRAND and rocRAND

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/hiprand and projects/rocrand

     E01  bash -lc '"$ROCRAND_FIXTURE" --manifest "$RNG_CASE" 2>&1 | tee rocrand-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$ROCRAND_FIXTURE" --manifest "$RNG_CASE" 2>&1 | tee rocrand-run.txt'

This line invokes `bash` in the hipRAND and rocRAND source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$ROCRAND_FIXTURE" --manifest "$RNG_CASE" 2>&1 | tee rocrand-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the hipRAND and rocRAND source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/hiprand and projects/rocrand

Revision: 2026-07-23

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is random-number portability API, generators, distributions, states, and output buffers. Its registered memory role is May create random states and output tensors for sampling or latent initialization in device memory.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$ROCRAND_FIXTURE" --manifest "$RNG_CASE" 2>&1 | tee rocrand-run.txt' The generator, seed, state, output dtype and checksum, placement, and dispatch are preserved.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hipsolver-rocsolver hipSOLVER and rocSOLVER 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

hipSOLVER and rocSOLVER

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/hipsolver and projects/rocsolver

     E01  bash -lc '"$ROCSOLVER_FIXTURE" --manifest "$SOLVER_CASE" 2>&1 | tee rocsolver-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$ROCSOLVER_FIXTURE" --manifest "$SOLVER_CASE" 2>&1 | tee rocsolver-run.txt'

This line invokes `bash` in the hipSOLVER and rocSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$ROCSOLVER_FIXTURE" --manifest "$SOLVER_CASE" 2>&1 | tee rocsolver-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the hipSOLVER and rocSOLVER source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/hipsolver and projects/rocsolver

Revision: 2026-07-23

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is dense and sparse linear-system and factorization portability API plus AMD backend. Its registered memory role is Reads matrices and solver metadata, uses workspaces and pivot buffers, and writes factors or solutions.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$ROCSOLVER_FIXTURE" --manifest "$SOLVER_CASE" 2>&1 | tee rocsolver-run.txt' The exact solver operation, matrix, workspace, dispatch, and numerical residual are preserved.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocalution rocALUTION 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

rocALUTION

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocalution

     E01  bash -lc '"$ROCALUTION_FIXTURE" --manifest "$ROCALUTION_CASE" 2>&1 | tee rocalution-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$ROCALUTION_FIXTURE" --manifest "$ROCALUTION_CASE" 2>&1 | tee rocalution-run.txt'

This line invokes `bash` in the rocALUTION source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$ROCALUTION_FIXTURE" --manifest "$ROCALUTION_CASE" 2>&1 | tee rocalution-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the rocALUTION source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocalution

Revision: 2026-07-23

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is iterative sparse solvers, preconditioners, matrix formats, and host-device movement. Its registered memory role is May place sparse matrices, vectors, preconditioners, staging buffers, and solver state across host memory and HBM.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$ROCALUTION_FIXTURE" --manifest "$ROCALUTION_CASE" 2>&1 | tee rocalution-run.txt' The matrix, solver, preconditioner, placements, movements, iterations, and residual are joined.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hipcub-rocprim hipCUB and rocPRIM 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

hipCUB and rocPRIM

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/hipcub and projects/rocprim

     E01  bash -lc '"$ROCPRIM_FIXTURE" --manifest "$PRIMITIVE_CASE" 2>&1 | tee rocprim-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$ROCPRIM_FIXTURE" --manifest "$PRIMITIVE_CASE" 2>&1 | tee rocprim-run.txt'

This line invokes `bash` in the hipCUB and rocPRIM source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$ROCPRIM_FIXTURE" --manifest "$PRIMITIVE_CASE" 2>&1 | tee rocprim-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the hipCUB and rocPRIM source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/hipcub and projects/rocprim

Revision: 2026-07-23

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is device and block primitives for scan, reduce, sort, select, partition, and memory operations. Its registered memory role is Reads and writes device ranges and temporary storage used by routing, sampling, indexing, sorting, and reduction paths.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$ROCPRIM_FIXTURE" --manifest "$PRIMITIVE_CASE" 2>&1 | tee rocprim-run.txt' The primitive, range, temporary storage, launch, dispatch, and correctness are joined.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocthrust rocThrust 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

rocThrust

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rocthrust

     E01  bash -lc '"$ROCTHRUST_FIXTURE" --manifest "$ROCTHRUST_CASE" 2>&1 | tee rocthrust-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$ROCTHRUST_FIXTURE" --manifest "$ROCTHRUST_CASE" 2>&1 | tee rocthrust-run.txt'

This line invokes `bash` in the rocThrust source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$ROCTHRUST_FIXTURE" --manifest "$ROCTHRUST_CASE" 2>&1 | tee rocthrust-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the rocThrust source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

If this line contributes to the dispatched implementation, it can change instruction mix, locality, HBM traffic, and elapsed time. Business value requires a correct output and same-run resource receipt.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rocthrust

Revision: 2026-07-23

comparison kernel bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is parallel algorithms, iterators, containers, scans, reductions, sorts, and transforms. Its registered memory role is May own device containers and temporary ranges for higher-level indexing, sorting, selection, transform, and reduction work.
  1. 01 · BEFOREWhat enters

    Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend.

  2. 02 · THIS SOURCEWhat role it owns

    Provides or invokes a device-oriented implementation candidate for a specific operation.

  3. 03 · AFTERWhat leaves

    A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

  4. 04 · VALUEWhy anyone cares

    A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the kernel layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

A better kernel can reduce time and data movement for a repeated operation. It matters financially only after end-to-end accepted work, power, and failure rates are measured.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Provides or invokes a device-oriented implementation candidate for a specific operation. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: Operands, shapes, dtypes, layouts, launch or benchmark arguments, and a selected software backend. Output boundary: A possible compiled device implementation and output buffer; dispatch and correctness still need receipts.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$ROCTHRUST_FIXTURE" --manifest "$ROCTHRUST_CASE" 2>&1 | tee rocthrust-run.txt' The algorithm, ranges, placement, temporary allocations, dispatch, and correctness are preserved.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-ucx-boundary UCX transport boundary 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

UCX transport boundary

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

src

     E01  bash -lc 'ucx_info -v > ucx-version.txt && ucx_info -d > ucx-devices.txt && "$UCX_FIXTURE" 2>&1 | tee ucx-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'ucx_info -v > ucx-version.txt && ucx_info -d > ucx-devices.txt && "$UCX_FIXTURE" 2>&1 | tee ucx-run.txt'

This line invokes `bash` in the UCX transport boundary source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'ucx_info -v > ucx-version.txt && ucx_info -d > ucx-devices.txt && "$UCX_FIXTURE" 2>&1 | tee ucx-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the UCX transport boundary source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: src

Revision: 2026-07-23

comparison profile bash coverage: parser_only observation: not_observed evidence: public_code
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is communication framework and transport selection above network and memory registration. Its registered memory role is Can register and move buffers between local or remote memory domains, but it is not an HBM allocator, cache policy, or physical fabric.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'ucx_info -v > ucx-version.txt && ucx_info -d > ucx-devices.txt && "$UCX_FIXTURE" 2>&1 | tee ucx-run.txt' The exact transport, registration, source and destination memory, payload, topology, and latency are joined.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-hipfile-infinity-storage hipFile and AMD Infinity Storage 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

hipFile and AMD Infinity Storage

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/hipfile

     E01  bash -lc 'ais-check --output ais-check.json && "$HIPFILE_FIXTURE" --manifest "$HIPFILE_CASE" 2>&1 | tee hipfile-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'ais-check --output ais-check.json && "$HIPFILE_FIXTURE" --manifest "$HIPFILE_CASE" 2>&1 | tee hipfile-run.txt'

This line invokes `bash` in the hipFile and AMD Infinity Storage source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'ais-check --output ais-check.json && "$HIPFILE_FIXTURE" --manifest "$HIPFILE_CASE" 2>&1 | tee hipfile-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the hipFile and AMD Infinity Storage source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line contributes a correctness or failure gate. It may add negligible direct acceleration, but it protects accepted-work rate, rollback safety, and trust—the denominator needed before performance or cost claims mean anything.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/hipfile

Revision: 2026-07-23

comparison engine bash coverage: parser_only observation: not_observed evidence: official_preliminary
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is early-access direct-to-GPU storage I/O with synchronous, asynchronous, batch, and POSIX fallback paths. Its registered memory role is Can move file-backed state between storage and device memory while preserving a distinct fallback path through host I/O.
  1. 01 · BEFOREWhat enters

    The request, model identity, context or media state, runtime configuration, and acceptance contract.

  2. 02 · THIS SOURCEWhat role it owns

    Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events.

  3. 03 · AFTERWhat leaves

    Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

  4. 04 · VALUEWhy anyone cares

    Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the engine layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Engine decisions can change latency, reuse, retries, reliability, and infrastructure demand. Business value exists only when the accepted result improves under the same contract.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Turns the accepted-work request and model state into scheduled runtime work, cache decisions, tool loops, or verifier events. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The request, model identity, context or media state, runtime configuration, and acceptance contract. Output boundary: Scheduled operations, state transitions, tool actions, or evidence records for the next layer.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'ais-check --output ais-check.json && "$HIPFILE_FIXTURE" --manifest "$HIPFILE_CASE" 2>&1 | tee hipfile-run.txt' The exact backend, fallback state, file and device buffers, payload, topology, latency, and checksum are joined.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rocm-aic ROCm AMD Infinity Context 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

ROCm AMD Infinity Context

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

README.md and docs

     E01  bash -lc 'git -C "$AIC_SRC" rev-parse HEAD > aic-revision.txt && docker compose -f "$AIC_COMPOSE" config > aic-compose.txt && "$AIC_BENCH" --manifest "$C001_MANIFEST" 2>&1 | tee aic-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'git -C "$AIC_SRC" rev-parse HEAD > aic-revision.txt && docker compose -f "$AIC_COMPOSE" config > aic-compose.txt && "$AIC_BENCH" --manifest "$C001_MANIFEST" 2>&1 | tee aic-run.txt'

This line invokes `bash` in the ROCm AMD Infinity Context source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'git -C "$AIC_SRC" rev-parse HEAD > aic-revision.txt && docker compose -f "$AIC_COMPOSE" config > aic-compose.txt && "$AIC_BENCH" --manifest "$C001_MANIFEST" 2>&1 | tee aic-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the ROCm AMD Infinity Context source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line can make a bottleneck observable and therefore reduce decision risk. It creates value through a trustworthy diagnosis, not through the profiler command by itself.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: README.md and docs

Revision: 2026-07-23

comparison profile bash coverage: parser_only observation: not_observed evidence: official_preliminary
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is early-access disaggregated KV-cache inference stack across GPU memory, CPU DRAM, local NVMe, and NFS over RDMA. Its registered memory role is Defines a tiered KV-state architecture and test harness; it does not prove that C-001 selected it or that any tier moved bytes.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'git -C "$AIC_SRC" rev-parse HEAD > aic-revision.txt && docker compose -f "$AIC_COMPOSE" config > aic-compose.txt && "$AIC_BENCH" --manifest "$C001_MANIFEST" 2>&1 | tee aic-run.txt' The exact C-001 request, KV blocks, tier policy, component versions, transfers, latency, and accepted patch share one run identity.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-vllm-lmcache-nixl-integration vLLM, LMCache, and NIXL ROCm integration 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

vLLM, LMCache, and NIXL ROCm integration

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

docker/Dockerfile, patches/lmcache, patches/nixl, and docs

     E01  bash -lc 'docker compose -f "$AIC_COMPOSE" config > integration-compose.txt && "$AIC_BENCH" --manifest "$C001_MANIFEST" --capture-kv-trace 2>&1 | tee integration-run.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'docker compose -f "$AIC_COMPOSE" config > integration-compose.txt && "$AIC_BENCH" --manifest "$C001_MANIFEST" --capture-kv-trace 2>&1 | tee integration-run.txt'

This line invokes `bash` in the vLLM, LMCache, and NIXL ROCm integration source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'docker compose -f "$AIC_COMPOSE" config > integration-compose.txt && "$AIC_BENCH" --manifest "$C001_MANIFEST" --capture-kv-trace 2>&1 | tee integration-run.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the vLLM, LMCache, and NIXL ROCm integration source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: docker/Dockerfile, patches/lmcache, patches/nixl, and docs

Revision: 2026-07-23

comparison power-cost bash coverage: parser_only observation: not_observed evidence: official_preliminary
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is version-pinned serving, KV block management, and transfer integration inside the AIC technology preview. Its registered memory role is Separates the serving engine, cache identity and policy, and movement backend across GPU, CPU, local storage, and network-storage tiers.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'docker compose -f "$AIC_COMPOSE" config > integration-compose.txt && "$AIC_BENCH" --manifest "$C001_MANIFEST" --capture-kv-trace 2>&1 | tee integration-run.txt' One run joins request, engine allocation, cache block identity, selected tier and backend, payload and wire bytes, latency, and accepted output.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-rdc ROCm Data Center Tool 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

ROCm Data Center Tool

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rdc

     E01  bash -lc 'rdci discovery -l > rdc-discovery.txt && rdci dmon -l > rdc-fields.txt && "$RDC_CAPTURE" --manifest "$WORKLOAD_INTERVAL" > rdc-capture.json'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'rdci discovery -l > rdc-discovery.txt && rdci dmon -l > rdc-fields.txt && "$RDC_CAPTURE" --manifest "$WORKLOAD_INTERVAL" > rdc-capture.json'

This line invokes `bash` in the ROCm Data Center Tool source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'rdci discovery -l > rdc-discovery.txt && rdci dmon -l > rdc-fields.txt && "$RDC_CAPTURE" --manifest "$WORKLOAD_INTERVAL" > rdc-capture.json'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the ROCm Data Center Tool source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line can connect the technical interval to energy or money only when power boundary, time, tariff or asset model, failures, and accepted outputs share one run identity.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rdc

Revision: 2026-07-23

comparison power-cost bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is data-center GPU discovery, groups, monitoring, diagnostics, policy, health, and telemetry. Its registered memory role is Can collect device health and memory-related telemetry around a workload interval without proving object-level HBM traffic.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'rdci discovery -l > rdc-discovery.txt && rdci dmon -l > rdc-fields.txt && "$RDC_CAPTURE" --manifest "$WORKLOAD_INTERVAL" > rdc-capture.json' Discovery, supported fields, diagnostics, telemetry, hardware identity, and the exact workload interval are joined.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-transferbench-rvs-boundary TransferBench and ROCm Validation Suite boundary 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

TransferBench and ROCm Validation Suite boundary

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/rccl/tools/TransferBench

     E01  bash -lc '"$TRANSFERBENCH" "$TRANSFER_CONFIG" 2>&1 | tee transferbench-run.txt && rvs -c "$RVS_CONFIG" -l rvs-run.log'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA / VALUPOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc '"$TRANSFERBENCH" "$TRANSFER_CONFIG" 2>&1 | tee transferbench-run.txt && rvs -c "$RVS_CONFIG" -l rvs-run.log'

This line invokes `bash` in the TransferBench and ROCm Validation Suite boundary source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc '"$TRANSFERBENCH" "$TRANSFER_CONFIG" 2>&1 | tee transferbench-run.txt && rvs -c "$RVS_CONFIG" -l rvs-run.log'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA / VALU
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the TransferBench and ROCm Validation Suite boundary source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/rccl/tools/TransferBench

Revision: 2026-07-23

comparison power-cost bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is simultaneous transfer benchmark versus broader platform validation and diagnostics. Its registered memory role is TransferBench measures configured copy paths; RVS checks system health. Neither proves a workload selected the path or that logical bytes equal HBM or wire bytes.
  1. 01 · BEFOREWhat enters

    The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count.

  2. 02 · THIS SOURCEWhat role it owns

    Connects a synchronized workload interval to resource, facility, and accepted-output accounting.

  3. 03 · AFTERWhat leaves

    Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

  4. 04 · VALUEWhy anyone cares

    This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the power-cost layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

This is the layer that can translate technical work into money, energy, and capacity. It fails closed when run identity or the accepted-output denominator is missing.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Connects a synchronized workload interval to resource, facility, and accepted-output accounting. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: The same run identity, task interval, power boundary, tariff or asset model, failures, and accepted-output count. Output boundary: Scoped energy and cost fields with uncertainty, or explicit unknowns when the receipt is incomplete.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc '"$TRANSFERBENCH" "$TRANSFER_CONFIG" 2>&1 | tee transferbench-run.txt && rvs -c "$RVS_CONFIG" -l rvs-run.log' The synthetic copy result and independent health validation are preserved separately with exact topology and configuration.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.

amd-legacy-tools-negative-guard Legacy ROCm-SMI, profiler, and RBT negative guard 1 lines AVAILABLE / NOT ON ACTIVE TRACE

START HERE · SEE THE CODE FIRST

Legacy ROCm-SMI, profiler, and RBT negative guard

bash

REGISTERED SOURCE · 1 DISPLAYED LINES

projects/amdsmi, projects/rocprofiler-sdk, projects/rocprofiler-compute, projects/rocprofiler-systems, projects/rccl/tools/TransferBench, and legacy project migration notices

     E01  bash -lc 'for tool in rocm-smi rocprof rocprofv2 rocm-bandwidth-test amd-smi rocprofv3 TransferBench; do command -v "$tool" || true; done > tool-routing.txt'

This is the complete source text registered for this teaching card. It may still be an excerpt of a larger upstream file.

CODE → GPU → HBM

How this registered source could connect to HBM

SOURCE REFERENCE · DEVICE PATH NOT CAPTURED

The source defines or requests one software action. The labels below show this card's registered software and candidate hardware boundaries. They are a process map, not an execution trace.

  1. Registered sourceSOURCE FACT
  2. ROCm / HIP library → AMD driverCANDIDATE LAYER
  3. LLVM AMDGPU → code objectCANDIDATE LAYER
  4. Queues → command processor / schedulerNOT CAPTURED
  5. CDNA XCD → CU → MFMA matrix corePOSSIBLE
  6. HBM memory controllers → MI355X HBM3E comparison boundaryPOSSIBLE
  7. Dispatch + counters + accepted outputMISSING RECEIPT

Why HBM matters: Only a joined run can show which cache levels and memory controllers were active, how many bytes reached accelerator-local memory, and whether the accepted task used less time, energy, or money.

LINE-BY-LINE EXPLANATION · 1 DISPLAYED LINES

Open one line only when you want the deeper explanation.

The uninterrupted registered source remains above. These rows connect one selected line to software, GPU, memory, business value, and missing proof.

E01 bash -lc 'for tool in rocm-smi rocprof rocprofv2 rocm-bandwidth-test amd-smi rocprofv3 TransferBench; do command -v "$tool" || true; done > tool-routing.txt'

This line invokes `bash` in the Legacy ROCm-SMI, profiler, and RBT negative guard source surface. The excerpt line is exact, but the upstream file line number is not registered.

Source
The host shell invokes `bash` with the displayed arguments and redirections.
Runtime / compiler
The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.
GPU execution
A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.
Memory path
Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.
Useful work / business implication
This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.
Evidence
Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.
Link to this line

SELECTED LINE → PHYSICAL PATH

AMD CDNA candidate path

SOURCE MAP · RUN NOT CAPTURED
Line 1 of 1 Read this exact line
bash -lc 'for tool in rocm-smi rocprof rocprofv2 rocm-bandwidth-test amd-smi rocprofv3 TransferBench; do command -v "$tool" || true; done > tool-routing.txt'
  1. 01 · SOURCEExact checked-in line
  2. 02 · RUNTIME / LIBRARYROCm / HIP library → AMD driver
  3. 03 · COMPILER / BINARYLLVM AMDGPU → code object
  4. 04 · GPU FRONT DOORQueues → command processor / scheduler
  5. 05 · COMPUTE BLOCKCDNA XCD → CU → MFMA matrix core
  6. 06 · ON-CHIP DATAVGPR → LDS / L1
  7. 07 · LAST-LEVEL CACHEInfinity Cache / L2
  8. 08 · MEMORY INTERFACEHBM memory controllers
  9. 09 · LOCAL MEMORYMI355X HBM3E comparison boundary
  10. 10 · RECEIPT GATEDispatch + counters + output + verifier
Directly defined by this line Possible downstream path Not reached by this line alone
What this line does

This line invokes `bash` in the Legacy ROCm-SMI, profiler, and RBT negative guard source surface. The excerpt line is exact, but the upstream file line number is not registered.

What changes next in software

The launched command decides whether it inventories a system, builds an artifact, starts a runtime, or submits device work; the shell line alone does not establish the child path.

What it means on the GPU

A host command does not identify a selected kernel, SM/CU, warp/wavefront, tensor or matrix unit, or copy engine.

How bytes could move

Only the child command plus a joined runtime trace can establish allocations, transfers, cache outcomes, HBM bytes, power, energy, water, or cost.

Why this line could matter to useful work

This line requests data movement. Direction, byte count, source and destination tiers, overlap, and achieved bandwidth determine latency and energy exposure. The source text alone does not prove the physical route or completed transfer.

What would prove it

Source-derived only. Dispatch, tensor values, addresses, HBM bytes, latency, power, energy, cooling, water, cost, and accepted output remain unobserved unless a same-run receipt explicitly supplies them.

Deeper context: provenance, evidence, and audience decisions

What this is: AMD and ROCm memory-software catalog · AMD / ROCm

Source path: projects/amdsmi, projects/rocprofiler-sdk, projects/rocprofiler-compute, projects/rocprofiler-systems, projects/rccl/tools/TransferBench, and legacy project migration notices

Revision: 2026-07-23

comparison profile bash coverage: parser_only observation: not_observed evidence: official_current
Indexed phases: not bound to a walkthrough phase

Evidence boundary: Registered source does not prove dispatch, tensor values, HBM traffic, latency, power, energy, water, cost, or an accepted result.

WHOLE SOURCE → SYSTEM → BUSINESS

Understand the complete excerpt before opening one line.

This bash excerpt belongs to AMD and ROCm memory-software catalog. Its registered role is fail-closed routing away from legacy ROCm-SMI, old profiler entry points, and the ROCm Bandwidth Test. Its registered memory role is Prevents stale tool output from being treated as current AMD SMI, rocprofv3, ROCm profiler, or TransferBench evidence.
  1. 01 · BEFOREWhat enters

    A pinned executable or workload interval plus profiler configuration and correlation identity.

  2. 02 · THIS SOURCEWhat role it owns

    Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload.

  3. 03 · AFTERWhat leaves

    Trace or counter artifacts that must be joined to the same output and verifier.

  4. 04 · VALUEWhy anyone cares

    Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

  5. 05 · PROOFWhat is still missing

    Official component identity plus a qualification command. No selected operator, device executable, HBM traffic, power interval, or accepted-workload receipt is captured.

Investor

Does this source prove a repeatable technical advantage, or only that a component exists?

Treat this as diligence on the profile layer for comparison. It shows inspectable source and an architecture relationship; it does not prove a durable performance or cost advantage.

Decision rule: Ask for the joined accepted-work receipt, reproducibility, portability limits, and who owns the integration work before underwriting value.

CEO

Which user outcome could this code change, and what still has to work?

Profiling reduces decision risk by showing where time and bytes actually go. A profiler installation or command is not itself a measured business improvement.

Decision rule: Fund the change only against the same user workflow, acceptance rule, reliability target, and rollback path.

CFO

Where could this code change money, energy, or capacity?

The mechanism may change runtime, retries, memory residency, hardware utilization, or engineering burden. None of those become dollars from source inspection alone.

Decision rule: Require measured task throughput, average power at a declared boundary, failure and retry cost, asset or rental accounting, and accepted outputs under one interval.

CTO

What architecture decision and technical risk does this source expose?

Collects runtime, kernel, memory, topology, or timing evidence needed to diagnose the workload. The current record is coverage=parser_only and observation=not_observed.

Decision rule: Check support matrices, source and artifact pins, fallback behavior, observability, portability, and the exact promotion test before standardizing the path.

Software engineer

What enters this excerpt, what leaves it, and where should I debug next?

Input boundary: A pinned executable or workload interval plus profiler configuration and correlation identity. Output boundary: Trace or counter artifacts that must be joined to the same output and verifier.

Decision rule: Trace the selected line into its caller, runtime or compiler artifact, device launch, output, and verifier without substituting an unrelated example.

Kernel / hardware engineer

Which physical block or memory path is plausible, and what proves it?

The synchronized map separates source-defined nodes from possible downstream GPU, cache, controller, and local-memory consequences.

Decision rule: Capture the selected implementation, executable, launch geometry, resource use, cache and HBM counters, elapsed interval, numerical result, and hardware identity.

Exact next proof needed to advance this source

bash -lc 'for tool in rocm-smi rocprof rocprofv2 rocm-bandwidth-test amd-smi rocprofv3 TransferBench; do command -v "$tool" || true; done > tool-routing.txt' Every legacy command is absent or explicitly quarantined and each accepted receipt names the maintained replacement and version.

CHECK YOUR UNDERSTANDING

What does this page prove right now?

Choose one answer. The page will explain the evidence boundary.